feat: roll-call votes + granular alert filter fix (v0.9.5)

Roll-call votes:
- Migration 0017: bill_votes + member_vote_positions tables
- Fetch vote XML directly from House Clerk / Senate LIS URLs
  embedded in bill actions recordedVotes objects
- GET /api/bills/{id}/votes triggers background fetch on first view
- VotePanel on bill detail: yea/nay bar, result badge, followed
  member positions with Sen./Rep. title, party badge, and state

Alert filter fix:
- _should_dispatch returns True when alert_filters is None so users
  who haven't saved filters still receive all notifications

Authored-By: Jack Levy

backend/app/api/bills.py

@@ -12,6 +12,7 @@ from app.schemas.schemas import (
     BillDetailSchema,
     BillSchema,
     BillActionSchema,
+    BillVoteSchema,
     NewsArticleSchema,
     PaginatedResponse,
     TrendScoreSchema,
@@ -202,6 +203,32 @@ async def get_bill_trend(bill_id: str, days: int = Query(30, ge=7, le=365), db:
     return result.scalars().all()
 
 
+@router.get("/{bill_id}/votes", response_model=list[BillVoteSchema])
+async def get_bill_votes_endpoint(bill_id: str, db: AsyncSession = Depends(get_db)):
+    from app.models.vote import BillVote
+    from sqlalchemy.orm import selectinload
+
+    result = await db.execute(
+        select(BillVote)
+        .where(BillVote.bill_id == bill_id)
+        .options(selectinload(BillVote.positions))
+        .order_by(desc(BillVote.vote_date))
+    )
+    votes = result.scalars().unique().all()
+
+    # Trigger background fetch if no votes are stored yet
+    if not votes:
+        bill = await db.get(Bill, bill_id)
+        if bill:
+            try:
+                from app.workers.vote_fetcher import fetch_bill_votes
+                fetch_bill_votes.delay(bill_id)
+            except Exception:
+                pass
+
+    return votes
+
+
 @router.post("/{bill_id}/draft-letter", response_model=DraftLetterResponse)
 async def generate_letter(bill_id: str, body: DraftLetterRequest, db: AsyncSession = Depends(get_db)):
     from app.models.setting import AppSetting