feat(subscribestar): flip dispatch to the native ingester (#893, Step 5)

SubscribeStar now downloads + verifies through the native core ingester instead
of gallery-dl — the go-live switch for milestone #71.

- download_backends: subscribestar added to NATIVE_INGESTER_PLATFORMS; a
  _NATIVE_INGESTERS registry + _resolve_native_campaign_id make _run_native_ingester
  / preview_source / verify_source_credential platform-aware. SubscribeStar's
  campaign_id IS the creator URL (no resolver); Patreon still resolves the vanity.
  preview now catches the shared NativeIngestError (covers both platforms).
- platform_lock: subscribestar serialized (one paced walk at a time).
- gallery_dl: subscribestar entry removed from PLATFORM_DEFAULTS (rule 22 — no
  fallback once native works).
- frontend SourceActions: isPatreon → isNative (patreon|subscribestar) so the
  recover/recapture actions show for subscribestar; download_service's
  cursor/mode/post_first + the preview endpoint already key on
  uses_native_ingester, so backfill/recovery/recapture/preview light up for free.
- tests: download_backends (subscribestar native), platform_lock (serialized),
  and three gallery-dl-sample tests repointed to hentaifoundry (api_credentials
  verify, gallery_dl_service skip-value, api_sources arm-no-preflight).

post_is_gated stays best-effort (can't cause junk downloads); not gating this.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/test_api_credentials.py

@@ -165,25 +165,26 @@ async def test_verify_runs_gallery_dl_and_stamps_on_success(client, db, monkeypa
         return (True, "Credentials valid — the feed authenticated.")
     monkeypatch.setattr(gdl_mod.GalleryDLService, "verify", _fake_verify)
 
+    # hentaifoundry is a gallery-dl platform (subscribestar migrated to native).
     await client.post("/api/credentials", json={
-        "platform": "subscribestar", "credential_type": "cookies", "data": _NETSCAPE,
+        "platform": "hentaifoundry", "credential_type": "cookies", "data": _NETSCAPE,
     })
     artist = Artist(name="Maewix", slug="maewix")
     db.add(artist)
     await db.flush()
     db.add(Source(
-        artist_id=artist.id, platform="subscribestar",
-        url="https://www.subscribestar.com/maewix", enabled=True, config_overrides={},
+        artist_id=artist.id, platform="hentaifoundry",
+        url="https://www.hentai-foundry.com/user/Maewix", enabled=True, config_overrides={},
     ))
     await db.commit()
 
-    resp = await client.post("/api/credentials/subscribestar/verify")
+    resp = await client.post("/api/credentials/hentaifoundry/verify")
     body = await resp.get_json()
     assert body["valid"] is True
     assert body["last_verified"] is not None
 
     # The stamp is persisted on the credential record.
-    rec = await (await client.get("/api/credentials/subscribestar")).get_json()
+    rec = await (await client.get("/api/credentials/hentaifoundry")).get_json()
     assert rec["last_verified"] is not None
 
 

tests/test_api_sources.py

@@ -430,8 +430,8 @@ async def test_gallery_dl_platform_arm_skips_pre_flight(client, artist, db, monk
     monkeypatch.setattr(db_mod, "verify_source_credential", _boom)
 
     src = Source(
-        artist_id=artist.id, platform="subscribestar",
-        url="https://www.subscribestar.com/x", enabled=True,
+        artist_id=artist.id, platform="hentaifoundry",
+        url="https://www.hentai-foundry.com/user/x", enabled=True,
     )
     db.add(src)
     await db.commit()

tests/test_download_backends.py

@@ -7,15 +7,16 @@ from backend.app.services.download_backends import (
 )
 
 
-def test_patreon_is_native():
-    assert uses_native_ingester("patreon") is True
-    assert "patreon" in NATIVE_INGESTER_PLATFORMS
+def test_native_platforms():
+    for platform in ("patreon", "subscribestar"):
+        assert uses_native_ingester(platform) is True
+        assert platform in NATIVE_INGESTER_PLATFORMS
 
 
 def test_gallery_dl_platforms_are_not_native():
-    # The five platforms still served by gallery-dl must NOT route to the
-    # native ingester — guards an accidental over-broad migration.
-    for platform in ("subscribestar", "hentaifoundry", "discord", "pixiv", "deviantart"):
+    # The platforms still served by gallery-dl must NOT route to the native
+    # ingester — guards an accidental over-broad migration.
+    for platform in ("hentaifoundry", "discord", "pixiv", "deviantart"):
         assert uses_native_ingester(platform) is False
 
 

tests/test_gallery_dl_service.py

@@ -259,7 +259,7 @@ def test_build_config_emits_tick_skip_value(gdl):
     scans once 20 contiguous archived items are seen."""
     from backend.app.services.gallery_dl import TICK_SKIP_VALUE
     cfg = gdl._build_config_for_source(
-        platform="subscribestar",
+        platform="hentaifoundry",
         source_config=SourceConfig(),
         artist_slug="alice",
         skip_value=TICK_SKIP_VALUE,
@@ -272,7 +272,7 @@ def test_build_config_emits_backfill_skip_value(gdl):
     full post history."""
     from backend.app.services.gallery_dl import BACKFILL_SKIP_VALUE
     cfg = gdl._build_config_for_source(
-        platform="subscribestar",
+        platform="hentaifoundry",
         source_config=SourceConfig(),
         artist_slug="alice",
         skip_value=BACKFILL_SKIP_VALUE,

tests/test_platform_lock.py

@@ -9,8 +9,14 @@ pytestmark = pytest.mark.integration
 
 def test_non_serialized_platform_has_no_lock():
     # gallery-dl platforms aren't capped — they get no lock at all.
-    assert platform_lock("subscribestar", ttl_seconds=60) is None
     assert platform_lock("deviantart", ttl_seconds=60) is None
+    assert platform_lock("hentaifoundry", ttl_seconds=60) is None
+
+
+def test_subscribestar_is_serialized():
+    # subscribestar is a native-ingester platform now — one paced walk at a time.
+    lock = platform_lock("subscribestar", ttl_seconds=60)
+    assert lock is not None
 
 
 def test_patreon_serializes_to_one_holder():