Add analysis status panel to admin page

- GET /api/admin/stats returns total bills, docs fetched, briefs generated
  (full + amendment), and remaining count
- Admin page shows stat cards + progress bar, auto-refreshes every 30s

Authored-By: Jack Levy

backend/app/api/admin.py

@@ -4,7 +4,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.dependencies import get_current_admin
 from app.database import get_db
-from app.models import Follow
+from app.models import Bill, BillBrief, BillDocument, Follow
 from app.models.user import User
 from app.schemas.schemas import UserResponse
 
@@ -79,6 +79,35 @@ async def toggle_admin(
     return user
 
 
+# ── Analysis Stats ────────────────────────────────────────────────────────────
+
+@router.get("/stats")
+async def get_stats(
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_admin),
+):
+    """Return analysis pipeline progress counters."""
+    total_bills = (await db.execute(select(func.count()).select_from(Bill))).scalar()
+    docs_fetched = (await db.execute(
+        select(func.count()).select_from(BillDocument).where(BillDocument.raw_text.isnot(None))
+    )).scalar()
+    total_briefs = (await db.execute(select(func.count()).select_from(BillBrief))).scalar()
+    full_briefs = (await db.execute(
+        select(func.count()).select_from(BillBrief).where(BillBrief.brief_type == "full")
+    )).scalar()
+    amendment_briefs = (await db.execute(
+        select(func.count()).select_from(BillBrief).where(BillBrief.brief_type == "amendment")
+    )).scalar()
+    return {
+        "total_bills": total_bills,
+        "docs_fetched": docs_fetched,
+        "briefs_generated": total_briefs,
+        "full_briefs": full_briefs,
+        "amendment_briefs": amendment_briefs,
+        "remaining": total_bills - total_briefs,
+    }
+
+
 # ── Celery Tasks ──────────────────────────────────────────────────────────────
 
 @router.post("/trigger-poll")