feat(forge): per-user forge connections — keyring, host-keyed resolution, project pin (#2778)

A forge token is a user's credential, not an instance's. The single
admin-settings config is replaced by per-user keyring rows (one per forge
host), and every server-side forge read runs on the PROJECT OWNER's keyring:

- forge_connections table + projects.forge_connection_id pin (migration 0078,
  which also carries the existing admin config into the first admin's row and
  deletes the old setting keys — no legacy dual-read)
- get_forge() replaced by get_forges(owner_id, project_id) -> ForgeSelector;
  resolve(repo) picks the connection whose host serves the repo. A pinned
  project uses ONLY its pinned connection; a stale pin (ownership moved) is
  ignored, never honored across users
- env FORGE_* config survives as an implicit entry for admin owners only;
  a stored row for the same host beats it
- consumers threaded: pull-time freshness (owner of the note), coverage
  (owner of the project), coverage routes' configured flag
- routes: /api/settings/forge-connections CRUD + per-connection test
  (own-rows only, tokens never returned); /api/admin/forge shrinks to
  /api/admin/forge-webhook (secret only); PUT /api/projects/<id>/forge pins,
  owner-or-admin asking, owner's connections only
- UI: Git Forges card moves to Settings -> Integrations as a connection
  list; webhook secret stays in the admin Config tab; owner-only forge
  select on the project coverage card
- backups exclude forge_connections (credentials, api_keys precedent) and
  the pin, so restores fall back to keyring resolution

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/src/views/SettingsView.vue

@@ -420,15 +420,25 @@ const baseUrl = ref("");
 const savingBaseUrl = ref(false);
 const baseUrlSaved = ref(false);
 
-// Git forge integration (admin only, #2689). The token round-trips masked;
-// the server treats the mask as "unchanged".
-const forge = ref({ kind: "", base_url: "", token: "", webhook_secret: "" });
-const forgeKinds = ref<string[]>(["gitea"]);
-const forgeConfigured = ref(false);
-const savingForge = ref(false);
-const forgeSaved = ref(false);
-const testingForge = ref(false);
-const forgeTestResult = ref<{ ok: boolean; message: string } | null>(null);
+// Git forge connections (#2778) — the user's keyring: one read-only
+// credential per forge host, used server-side for every forge read on
+// projects this user owns. The token round-trips masked; the server treats
+// the mask as "unchanged".
+interface ForgeConnectionEntry {
+  id: number; kind: string; base_url: string; host: string;
+}
+const forgeConnections = ref<ForgeConnectionEntry[]>([]);
+const forgeKinds = ref<string[]>(["gitea", "github"]);
+const connForm = ref({ id: 0, kind: "gitea", base_url: "", token: "" });
+const connFormOpen = ref(false);
+const savingConn = ref(false);
+const testingConnId = ref(0);
+const connTestResult = ref<{ id: number; ok: boolean; message: string } | null>(null);
+// The webhook secret stays admin: the push endpoint is one URL per instance
+// and authenticates deliveries, not users.
+const forgeWebhookSecret = ref("");
+const savingForgeWebhook = ref(false);
+const forgeWebhookSaved = ref(false);
 
 
 // Search test (SearXNG)
@@ -576,25 +586,30 @@ onMounted(async () => {
       // base URL not configured yet
     }
     try {
-      await loadForgeSettings();
+      await loadForgeWebhook();
     } catch {
-      // forge not configured yet
+      // webhook secret not configured yet
     }
   }
+  try {
+    await loadForgeConnections();
+  } catch {
+    // no keyring yet — the ordinary state
+  }
   _loadTabContent(activeTab.value);
 });
 
-async function loadForgeSettings() {
-  const cfg = await apiGet<{
-    kind: string; base_url: string; token: string; webhook_secret: string;
-    configured: boolean; kinds: string[];
-  }>("/api/admin/forge");
-  forge.value = {
-    kind: cfg.kind, base_url: cfg.base_url, token: cfg.token,
-    webhook_secret: cfg.webhook_secret,
-  };
-  forgeConfigured.value = cfg.configured;
-  if (cfg.kinds?.length) forgeKinds.value = cfg.kinds;
+async function loadForgeConnections() {
+  const res = await apiGet<{
+    connections: ForgeConnectionEntry[]; kinds: string[];
+  }>("/api/settings/forge-connections");
+  forgeConnections.value = res.connections;
+  if (res.kinds?.length) forgeKinds.value = res.kinds;
+}
+
+async function loadForgeWebhook() {
+  const cfg = await apiGet<{ webhook_secret: string }>("/api/admin/forge-webhook");
+  forgeWebhookSecret.value = cfg.webhook_secret;
 }
 
 async function changeEmail() {
@@ -762,42 +777,77 @@ async function sendTestEmail() {
   }
 }
 
-async function saveForge() {
-  savingForge.value = true;
-  forgeSaved.value = false;
-  forgeTestResult.value = null;
+function editConnection(c: ForgeConnectionEntry | null) {
+  connTestResult.value = null;
+  connFormOpen.value = true;
+  connForm.value = c
+    ? { id: c.id, kind: c.kind, base_url: c.base_url, token: "********" }
+    : { id: 0, kind: forgeKinds.value[0] || "gitea", base_url: "", token: "" };
+}
+
+async function saveConnection() {
+  savingConn.value = true;
   try {
-    await apiPut("/api/admin/forge", forge.value);
-    await loadForgeSettings();
-    forgeSaved.value = true;
-    setTimeout(() => (forgeSaved.value = false), 2000);
+    const { id, ...values } = connForm.value;
+    if (id) await apiPut(`/api/settings/forge-connections/${id}`, values);
+    else await apiPost("/api/settings/forge-connections", values);
+    connFormOpen.value = false;
+    await loadForgeConnections();
   } catch (e) {
     const body = (e as { body?: { error?: string } }).body;
-    toastStore.show(body?.error || "Failed to save forge settings", "error");
+    toastStore.show(body?.error || "Failed to save forge connection", "error");
   } finally {
-    savingForge.value = false;
+    savingConn.value = false;
   }
 }
 
-async function testForge() {
-  testingForge.value = true;
-  forgeTestResult.value = null;
+async function removeConnection(id: number) {
+  try {
+    await apiDelete(`/api/settings/forge-connections/${id}`);
+    connTestResult.value = null;
+    await loadForgeConnections();
+  } catch (e) {
+    const body = (e as { body?: { error?: string } }).body;
+    toastStore.show(body?.error || "Failed to delete forge connection", "error");
+  }
+}
+
+async function testConnection(id: number) {
+  testingConnId.value = id;
+  connTestResult.value = null;
   try {
     const res = await apiPost<{ version: string; username: string }>(
-      "/api/admin/forge/test", {},
+      `/api/settings/forge-connections/${id}/test`, {},
     );
-    forgeTestResult.value = {
-      ok: true,
-      message: `Connected — Gitea ${res.version}, authenticated as ${res.username}`,
+    connTestResult.value = {
+      id, ok: true,
+      message: `Connected — ${res.version}, authenticated as ${res.username}`,
     };
   } catch (e) {
     const body = (e as { body?: { error?: string } }).body;
-    forgeTestResult.value = {
-      ok: false,
+    connTestResult.value = {
+      id, ok: false,
       message: body?.error || "Connection test failed",
     };
   } finally {
-    testingForge.value = false;
+    testingConnId.value = 0;
+  }
+}
+
+async function saveForgeWebhook() {
+  savingForgeWebhook.value = true;
+  try {
+    await apiPut("/api/admin/forge-webhook", {
+      webhook_secret: forgeWebhookSecret.value,
+    });
+    await loadForgeWebhook();
+    forgeWebhookSaved.value = true;
+    setTimeout(() => (forgeWebhookSaved.value = false), 2000);
+  } catch (e) {
+    const body = (e as { body?: { error?: string } }).body;
+    toastStore.show(body?.error || "Failed to save webhook secret", "error");
+  } finally {
+    savingForgeWebhook.value = false;
   }
 }
 
@@ -1710,6 +1760,70 @@ function formatUserDate(iso: string): string {
         </template>
       </section>
 
+      <section class="settings-section full-width">
+        <h2>Git Forges</h2>
+        <p class="section-desc">
+          Read-only connections to your git forges, one per host. Projects you
+          own use them server-side — resolved by repo host — to fetch and
+          drift-check recorded snippets and measure pattern coverage. A
+          read-scope token is enough. Gitea: an access token with read scope
+          on repositories. GitHub: a fine-grained PAT with Contents:
+          Read-only, base URL <code>https://github.com</code> (or your GitHub
+          Enterprise URL).
+        </p>
+        <table v-if="forgeConnections.length" class="api-keys-table">
+          <thead>
+            <tr><th>Host</th><th>Kind</th><th>Base URL</th><th></th></tr>
+          </thead>
+          <tbody>
+            <tr v-for="c in forgeConnections" :key="c.id">
+              <td>{{ c.host }}</td>
+              <td>{{ c.kind }}</td>
+              <td><code>{{ c.base_url }}</code></td>
+              <td>
+                <button class="btn btn-secondary btn-sm" :disabled="testingConnId === c.id" @click="testConnection(c.id)">
+                  {{ testingConnId === c.id ? "Testing…" : "Test" }}
+                </button>
+                <button class="btn btn-secondary btn-sm" @click="editConnection(c)">Edit</button>
+                <button class="btn btn-danger btn-sm" @click="removeConnection(c.id)">Delete</button>
+              </td>
+            </tr>
+          </tbody>
+        </table>
+        <p v-else class="section-desc not-configured">No forge connections yet.</p>
+        <p
+          v-if="connTestResult"
+          :class="connTestResult.ok ? 'text-success' : 'text-error'"
+        >
+          {{ connTestResult.message }}
+        </p>
+        <div v-if="connFormOpen" class="smtp-grid">
+          <div class="field">
+            <label for="conn-kind">Forge</label>
+            <select id="conn-kind" v-model="connForm.kind" class="input">
+              <option v-for="k in forgeKinds" :key="k" :value="k">{{ k }}</option>
+            </select>
+          </div>
+          <div class="field">
+            <label for="conn-base-url">Base URL</label>
+            <input id="conn-base-url" v-model="connForm.base_url" type="text" placeholder="https://git.example.com" class="input" />
+          </div>
+          <div class="field">
+            <label for="conn-token">API Token (read scope)</label>
+            <input id="conn-token" v-model="connForm.token" type="password" class="input" />
+          </div>
+        </div>
+        <div class="actions">
+          <template v-if="connFormOpen">
+            <button class="btn-primary" @click="saveConnection" :disabled="savingConn">
+              {{ savingConn ? "Saving..." : connForm.id ? "Save Connection" : "Add Connection" }}
+            </button>
+            <button class="btn-ghost" @click="connFormOpen = false">Cancel</button>
+          </template>
+          <button v-else class="btn-primary" @click="editConnection(null)">Add Connection</button>
+        </div>
+      </section>
+
     </div>
 
     <!-- ── Data ── -->
@@ -2161,61 +2275,26 @@ function formatUserDate(iso: string): string {
       </section>
 
       <section class="settings-section full-width">
-        <h2>Git Forge</h2>
+        <h2>Forge Webhook</h2>
         <p class="section-desc">
-          Optional read-only connection to your git forge (Gitea or GitHub) so
-          snippet code can be fetched, drift-checked, and coverage-measured
-          server-side. A read-scope token is enough. Leave the kind unset to
-          keep the integration off.
+          Forge connections are per-user (Settings → Integrations → Git
+          Forges). What stays instance-wide is the push webhook: create one on
+          the forge pointing at <code>/api/webhooks/forge</code> with this
+          secret, and snippets whose recorded files change get flagged for
+          re-verification.
         </p>
         <div class="smtp-grid">
-          <div class="field">
-            <label for="forge-kind">Forge</label>
-            <select id="forge-kind" v-model="forge.kind" class="input">
-              <option value="">Off</option>
-              <option v-for="k in forgeKinds" :key="k" :value="k">{{ k }}</option>
-            </select>
-          </div>
-          <div class="field">
-            <label for="forge-base-url">Base URL</label>
-            <input id="forge-base-url" v-model="forge.base_url" type="text" placeholder="https://git.example.com" class="input" />
-          </div>
-          <div class="field">
-            <label for="forge-token">API Token (read scope)</label>
-            <input id="forge-token" v-model="forge.token" type="password" class="input" />
-            <p class="field-hint">
-              Gitea: an access token with read scope on repositories. GitHub:
-              a fine-grained PAT with Contents: Read-only (or a classic token
-              with repo read). For GitHub, use
-              <code>https://github.com</code> as the base URL — or your
-              GitHub Enterprise instance's URL.
-            </p>
-          </div>
           <div class="field">
             <label for="forge-webhook-secret">Webhook Secret</label>
-            <input id="forge-webhook-secret" v-model="forge.webhook_secret" type="password" class="input" />
-            <p class="field-hint">
-              Optional: create a push webhook on the forge pointing at
-              <code>/api/webhooks/forge</code> with this secret, and snippets
-              whose recorded files change get flagged for re-verification.
-            </p>
+            <input id="forge-webhook-secret" v-model="forgeWebhookSecret" type="password" class="input" />
           </div>
         </div>
-        <div class="actions" style="margin-bottom: 1.25rem;">
-          <button class="btn-primary" @click="saveForge" :disabled="savingForge">
-            {{ savingForge ? "Saving..." : "Save Forge Settings" }}
+        <div class="actions">
+          <button class="btn-primary" @click="saveForgeWebhook" :disabled="savingForgeWebhook">
+            {{ savingForgeWebhook ? "Saving..." : "Save Webhook Secret" }}
           </button>
-          <button class="btn-ghost" @click="testForge" :disabled="testingForge || !forgeConfigured">
-            {{ testingForge ? "Testing..." : "Test Connection" }}
-          </button>
-          <span v-if="forgeSaved" class="saved-msg">Saved!</span>
+          <span v-if="forgeWebhookSaved" class="saved-msg">Saved!</span>
         </div>
-        <p
-          v-if="forgeTestResult"
-          :class="forgeTestResult.ok ? 'text-success' : 'text-error'"
-        >
-          {{ forgeTestResult.message }}
-        </p>
       </section>
 
     </div>