feat: API routes — speakers, rooms, search, RAG

Full implementations replacing stubs: speakers CRUD with utterance count,
rooms list + mute/unmute via pipeline, FTS5-based search, RAG /ask and
/summary endpoints. 15 route tests (8 new) all passing; 35 total.

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

app/api/routes/search.py

@@ -1,6 +1,26 @@
+import sqlite3
+from typing import Optional
 from fastapi import APIRouter
 
 
 def make_router(settings, db_factory):
     router = APIRouter(prefix="/api")
+
+    @router.get("/search")
+    def search(q: str, date: Optional[str] = None):
+        if not q.strip():
+            return []
+        db: sqlite3.Connection = db_factory()
+        rows = db.execute("""
+            SELECT u.*, r.name as room_name, s.name as speaker_name
+            FROM utterances_fts fts
+            JOIN utterances u ON u.id = fts.rowid
+            JOIN rooms r ON u.room_id = r.id
+            LEFT JOIN speakers s ON u.speaker_id = s.id
+            WHERE utterances_fts MATCH ?
+            ORDER BY u.start_time DESC
+            LIMIT 100
+        """, (q.strip(),)).fetchall()
+        return [dict(r) for r in rows]
+
     return router