Add per-indexer ratio-based seeding policy

Introduce a per-indexer ratioLimit alongside seedingTimeMinutes to control torrent cleanup. Updates include: documentation (scheduler and settings pages), types and API (saved indexer config now includes ratioLimit), setup and management UI (new TorrentSeedingFields component, modal wiring, validation and handlers), and processor logic (cleanup-seeded-torrents now requires AND-semantics between time and ratio; 0 disables a criterion, both 0 = never cleaned, undefined client ratio with ratioLimit>0 = not met). Tests were added/updated to cover ratio-only, time+ratio, missing-ratio, and UI interactions. Default behavior: ratioLimit defaults to 0 (no ratio requirement).

tests/api/admin-settings-prowlarr-indexers.routes.test.ts

@@ -53,7 +53,7 @@ describe('Admin Prowlarr indexers route', () => {
 
   it('saves indexer configuration', async () => {
     authRequest.json.mockResolvedValue({
-      indexers: [{ id: 1, name: 'Indexer', protocol: 'torrent', enabled: true, priority: 10, seedingTimeMinutes: 0 }],
+      indexers: [{ id: 1, name: 'Indexer', protocol: 'torrent', enabled: true, priority: 10, seedingTimeMinutes: 0, ratioLimit: 1.5 }],
       flagConfigs: [],
     });
 
@@ -63,6 +63,11 @@ describe('Admin Prowlarr indexers route', () => {
 
     expect(payload.success).toBe(true);
     expect(configServiceMock.setMany).toHaveBeenCalled();
+    const setManyArg = configServiceMock.setMany.mock.calls[0][0];
+    const indexersEntry = setManyArg.find((e: any) => e.key === 'prowlarr_indexers');
+    expect(indexersEntry).toBeDefined();
+    const persisted = JSON.parse(indexersEntry.value);
+    expect(persisted[0]).toMatchObject({ id: 1, ratioLimit: 1.5, seedingTimeMinutes: 0 });
   });
 });