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/rag.py

@@ -1,6 +1,66 @@
-from fastapi import APIRouter
+import sqlite3
+import httpx
+from typing import Optional
+from fastapi import APIRouter, HTTPException
+from pydantic import BaseModel
+from app.shared.config import Settings
 
 
-def make_router(settings, db_factory):
+class AskRequest(BaseModel):
+    question: str
+    date: Optional[str] = None
+
+
+def make_router(settings: Settings, db_factory):
     router = APIRouter(prefix="/api")
+
+    @router.post("/ask")
+    def ask(body: AskRequest):
+        db: sqlite3.Connection = db_factory()
+        rows = db.execute("""
+            SELECT u.start_time, u.transcript, r.name as room_name, s.name as speaker_name
+            FROM utterances u
+            JOIN rooms r ON u.room_id = r.id
+            LEFT JOIN speakers s ON u.speaker_id = s.id
+            WHERE date(u.start_time) = date(?)
+            ORDER BY u.start_time ASC
+            LIMIT 200
+        """, (body.date or "now",)).fetchall()
+
+        context_lines = [
+            f"[{r['room_name']} {r['start_time']}] {r['speaker_name'] or 'Unknown'}: {r['transcript']}"
+            for r in rows
+        ]
+        context = "\n".join(context_lines) if context_lines else "(no transcripts for this date)"
+
+        prompt = (
+            f"You are a helpful assistant with access to household conversation transcripts.\n\n"
+            f"Transcripts:\n{context}\n\n"
+            f"Question: {body.question}\n\n"
+            f"Answer based only on the transcripts above. Cite the time and room when relevant."
+        )
+
+        resp = httpx.post(
+            f"{settings.ollama_url}/api/chat",
+            json={
+                "model": settings.ollama_model,
+                "messages": [{"role": "user", "content": prompt}],
+                "stream": False,
+            },
+            timeout=60.0,
+        )
+        resp.raise_for_status()
+        answer = resp.json()["message"]["content"]
+        return {"answer": answer, "context_count": len(rows)}
+
+    @router.get("/summary/{date}")
+    def get_summary(date: str):
+        db: sqlite3.Connection = db_factory()
+        row = db.execute(
+            "SELECT * FROM daily_summaries WHERE date=?", (date,)
+        ).fetchone()
+        if not row:
+            raise HTTPException(404, f"No summary for {date}")
+        return dict(row)
+
     return router