feat(admin): metadata-profile picker on integrations page

Persists the operator's metadata-profile choice alongside quality
profile + root folder. Defaults to the first profile Lidarr returns
(usually 'Standard' on a vanilla install) so the common case is
zero-click; operators with custom profiles like 'Singles only' can pick
explicitly.

Backend:
- Migration 0013: adds nullable default_metadata_profile_id to
  lidarr_config. Existing rows get NULL and the service falls back to
  fetch-and-pick-first until they save.
- Updated lidarr_config queries + sqlc + lidarrconfig.Config + admin
  view/put body to round-trip the new field.
- handlePutLidarrConfig requires it (along with QP and root folder)
  when enabled=true — matches the existing missing_defaults gate.
- New GET /api/admin/lidarr/metadata-profiles handler + lidarr.Client
  ListMetadataProfiles (GET /api/v1/metadataprofile, same shape as
  the quality-profile endpoint).
- lidarrrequests.Approve prefers cfg.DefaultMetadataProfileID; falls
  back to the fetch-list path only when 0 (back-compat for upgraders).

Frontend:
- LidarrConfig type + LidarrMetadataProfile type + qk.lidarrMetadataProfiles.
- listMetadataProfiles + createMetadataProfilesQuery client helpers.
- Integrations page: third <select> picker, auto-defaults to first
  profile when the saved value is 0, sends the new field on save and
  clears it on disconnect.
- Updated test fixtures + the duplicate 'Standard' option string in
  the dropdown-populates assertion.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

web/src/routes/admin/integrations/+page.svelte

@@ -4,6 +4,7 @@
   import {
     createLidarrConfigQuery,
     createQualityProfilesQuery,
+    createMetadataProfilesQuery,
     createRootFoldersQuery,
     putLidarrConfig,
     testLidarrConnection
@@ -26,6 +27,7 @@
   let baseUrl = $state('');
   let apiKeyInput = $state(''); // intentionally never seeded with '***'
   let qualityId = $state<number>(0);
+  let metadataId = $state<number>(0);
   let rootPath = $state<string>('');
   let initialized = false;
 
@@ -34,6 +36,7 @@
     if (c && !initialized) {
       baseUrl = c.base_url;
       qualityId = c.default_quality_profile_id;
+      metadataId = c.default_metadata_profile_id;
       rootPath = c.default_root_folder_path;
       initialized = true;
     }
@@ -41,13 +44,18 @@
 
   // Auto-default to the first option Lidarr returns when the operator
   // hasn't picked one yet. Saves a click for the common case (one
-  // quality profile + one root folder, which is what most home setups
-  // have). The operator can still change either before saving.
+  // profile + one root folder, which is what most home setups have).
+  // The operator can still change any of them before saving.
   $effect(() => {
     if (qualityId === 0 && profiles.data && profiles.data.length > 0) {
       qualityId = profiles.data[0].id;
     }
   });
+  $effect(() => {
+    if (metadataId === 0 && metadataProfiles.data && metadataProfiles.data.length > 0) {
+      metadataId = metadataProfiles.data[0].id;
+    }
+  });
   $effect(() => {
     if (rootPath === '' && folders.data && folders.data.length > 0) {
       rootPath = folders.data[0].path;
@@ -61,6 +69,9 @@
   const profilesStore = $derived(createQualityProfilesQuery(profilesEnabled));
   const profiles = $derived($profilesStore);
 
+  const metadataProfilesStore = $derived(createMetadataProfilesQuery(profilesEnabled));
+  const metadataProfiles = $derived($metadataProfilesStore);
+
   const foldersStore = $derived(createRootFoldersQuery(profilesEnabled));
   const folders = $derived($foldersStore);
 
@@ -78,6 +89,7 @@
         base_url: baseUrl,
         api_key: apiKeyInput, // empty string tells backend "preserve saved key"
         default_quality_profile_id: qualityId,
+        default_metadata_profile_id: metadataId,
         default_root_folder_path: rootPath
       };
       await putLidarrConfig(cfg);
@@ -86,6 +98,7 @@
       await Promise.all([
         client.invalidateQueries({ queryKey: qk.lidarrConfig() }),
         client.invalidateQueries({ queryKey: qk.lidarrQualityProfiles() }),
+        client.invalidateQueries({ queryKey: qk.lidarrMetadataProfiles() }),
         client.invalidateQueries({ queryKey: qk.lidarrRootFolders() })
       ]);
       apiKeyInput = '';
@@ -126,11 +139,13 @@
         base_url: '',
         api_key: '',
         default_quality_profile_id: 0,
+        default_metadata_profile_id: 0,
         default_root_folder_path: ''
       });
       await Promise.all([
         client.invalidateQueries({ queryKey: qk.lidarrConfig() }),
         client.invalidateQueries({ queryKey: qk.lidarrQualityProfiles() }),
+        client.invalidateQueries({ queryKey: qk.lidarrMetadataProfiles() }),
         client.invalidateQueries({ queryKey: qk.lidarrRootFolders() })
       ]);
       modalOpen = false;
@@ -212,6 +227,19 @@
       </select>
     </label>
 
+    <label class="block">
+      <span class="block text-sm text-text-secondary">Default metadata profile</span>
+      <select
+        bind:value={metadataId}
+        disabled={!profilesEnabled || metadataProfiles.isPending}
+        class="mt-1 w-full rounded-md border border-border bg-background px-3 py-2 text-sm text-text-primary focus:outline-none focus:ring-2 focus:ring-accent disabled:opacity-50"
+      >
+        {#each metadataProfiles.data ?? [] as p (p.id)}
+          <option value={p.id}>{p.name}</option>
+        {/each}
+      </select>
+    </label>
+
     <label class="block">
       <span class="block text-sm text-text-secondary">Default root folder</span>
       <select

web/src/routes/admin/integrations/integrations.test.ts

@@ -13,6 +13,7 @@ vi.mock('@tanstack/svelte-query', async (orig) => {
 vi.mock('$lib/api/admin', () => ({
   createLidarrConfigQuery: vi.fn(),
   createQualityProfilesQuery: vi.fn(),
+  createMetadataProfilesQuery: vi.fn(),
   createRootFoldersQuery: vi.fn(),
   putLidarrConfig: vi.fn(),
   testLidarrConnection: vi.fn()
@@ -22,6 +23,7 @@ import IntegrationsPage from './+page.svelte';
 import {
   createLidarrConfigQuery,
   createQualityProfilesQuery,
+  createMetadataProfilesQuery,
   createRootFoldersQuery,
   putLidarrConfig,
   testLidarrConnection
@@ -32,6 +34,7 @@ const cfgConnected: LidarrConfig = {
   base_url: 'http://lidarr.local',
   api_key: '***',
   default_quality_profile_id: 1,
+  default_metadata_profile_id: 1,
   default_root_folder_path: '/music'
 };
 
@@ -40,6 +43,7 @@ const cfgUnset: LidarrConfig = {
   base_url: '',
   api_key: '',
   default_quality_profile_id: 0,
+  default_metadata_profile_id: 0,
   default_root_folder_path: ''
 };
 
@@ -59,6 +63,14 @@ function setup(opts: { config?: LidarrConfig } = {}) {
       ]
     })
   );
+  (createMetadataProfilesQuery as ReturnType<typeof vi.fn>).mockReturnValue(
+    mockQuery({
+      data: [
+        { id: 1, name: 'Standard' },
+        { id: 2, name: 'Singles only' }
+      ]
+    })
+  );
   (createRootFoldersQuery as ReturnType<typeof vi.fn>).mockReturnValue(
     mockQuery({ data: [{ path: '/music', accessible: true, free_space: 0 }] })
   );
@@ -164,10 +176,12 @@ describe('/admin/integrations', () => {
     );
   });
 
-  test('Quality profile and root folder dropdowns populate from API', () => {
+  test('Quality / metadata / root folder dropdowns populate from API', () => {
     setup();
-    expect(screen.getByText('Standard')).toBeInTheDocument();
+    // 'Standard' appears in both quality + metadata fixtures, so use *AllBy*.
+    expect(screen.getAllByText('Standard').length).toBeGreaterThanOrEqual(2);
     expect(screen.getByText('Lossless')).toBeInTheDocument();
+    expect(screen.getByText('Singles only')).toBeInTheDocument();
     expect(screen.getByText('/music')).toBeInTheDocument();
   });