refactor: replace Meilisearch with PostgreSQL full-text search

Remove Meilisearch dependency entirely. Search is now handled by
PostgreSQL ILIKE with pg_trgm indexes, joining series_metadata for
series-level authors. No external search engine needed.

- Replace search.rs Meilisearch HTTP calls with PostgreSQL queries
- Remove meili.rs from indexer, sync_meili call from job pipeline
- Remove MEILI_URL/MEILI_MASTER_KEY from config, state, env files
- Remove meilisearch service from docker-compose.yml
- Add migration 0027: drop sync_metadata, enable pg_trgm, add indexes
- Remove search resync button/endpoint (no longer needed)
- Update all documentation (CLAUDE.md, README.md, AGENTS.md, PLAN.md)

API contract unchanged — same SearchResponse shape returned.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/backoffice/app/api/settings/search/resync/route.ts

@@ -1,11 +0,0 @@
-import { NextResponse } from "next/server";
-import { forceSearchResync } from "@/lib/api";
-
-export async function POST() {
-  try {
-    const data = await forceSearchResync();
-    return NextResponse.json(data);
-  } catch (error) {
-    return NextResponse.json({ error: "Failed to trigger search resync" }, { status: 500 });
-  }
-}

apps/backoffice/app/settings/SettingsPage.tsx

@@ -21,9 +21,6 @@ export default function SettingsPage({ initialSettings, initialCacheStats, initi
   const [clearResult, setClearResult] = useState<ClearCacheResponse | null>(null);
   const [isSaving, setIsSaving] = useState(false);
   const [saveMessage, setSaveMessage] = useState<string | null>(null);
-  const [isResyncing, setIsResyncing] = useState(false);
-  const [resyncResult, setResyncResult] = useState<{ success: boolean; message: string } | null>(null);
-
   // Komga sync state — URL and username are persisted in settings
   const [komgaUrl, setKomgaUrl] = useState("");
   const [komgaUsername, setKomgaUsername] = useState("");
@@ -89,20 +86,6 @@ export default function SettingsPage({ initialSettings, initialCacheStats, initi
     }
   }
 
-  async function handleSearchResync() {
-    setIsResyncing(true);
-    setResyncResult(null);
-    try {
-      const response = await fetch("/api/settings/search/resync", { method: "POST" });
-      const result = await response.json();
-      setResyncResult(result);
-    } catch {
-      setResyncResult({ success: false, message: "Failed to trigger search resync" });
-    } finally {
-      setIsResyncing(false);
-    }
-  }
-
   const fetchReports = useCallback(async () => {
     try {
       const resp = await fetch("/api/komga/reports");
@@ -365,43 +348,6 @@ export default function SettingsPage({ initialSettings, initialCacheStats, initi
         </CardContent>
       </Card>
 
-      {/* Search Index */}
-      <Card className="mb-6">
-        <CardHeader>
-          <CardTitle className="flex items-center gap-2">
-            <Icon name="search" size="md" />
-            Search Index
-          </CardTitle>
-          <CardDescription>Force a full resync of the Meilisearch index. This will re-index all books on the next indexer cycle.</CardDescription>
-        </CardHeader>
-        <CardContent>
-          <div className="space-y-4">
-            {resyncResult && (
-              <div className={`p-3 rounded-lg ${resyncResult.success ? 'bg-success/10 text-success' : 'bg-destructive/10 text-destructive'}`}>
-                {resyncResult.message}
-              </div>
-            )}
-
-            <Button
-              onClick={handleSearchResync}
-              disabled={isResyncing}
-            >
-              {isResyncing ? (
-                <>
-                  <Icon name="spinner" size="sm" className="animate-spin -ml-1 mr-2" />
-                  Scheduling...
-                </>
-              ) : (
-                <>
-                  <Icon name="refresh" size="sm" className="mr-2" />
-                  Force Search Resync
-                </>
-              )}
-            </Button>
-          </div>
-        </CardContent>
-      </Card>
-
       {/* Limits Settings */}
       <Card className="mb-6">
         <CardHeader>

apps/backoffice/lib/api.ts

@@ -406,12 +406,6 @@ export async function getThumbnailStats() {
   return apiFetch<ThumbnailStats>("/settings/thumbnail/stats");
 }
 
-export async function forceSearchResync() {
-  return apiFetch<{ success: boolean; message: string }>("/settings/search/resync", {
-    method: "POST",
-  });
-}
-
 export async function convertBook(bookId: string) {
   return apiFetch<IndexJobDto>(`/books/${bookId}/convert`, { method: "POST" });
 }