Add bill action pipeline, admin health panel, and LLM provider fixes

- Fetch bill actions from Congress.gov and populate the action timeline
- Add nightly batch task and beat schedule for active bill actions
- Add admin reprocess endpoint for per-bill debugging
- Add BriefPanel with "What Changed" view and version history
- Add External API Health section with per-source latency testing
- Redesign Manual Controls as health panel with status dots and descriptions
- Add Resume Analysis task for stalled LLM jobs
- Add Backfill Dates & Links task for bills with null metadata
- Fix LLM provider/model DB overrides being ignored (env vars used instead)
- Fix Gemini 404: gemini-1.5-pro deprecated → gemini-2.0-flash
- Fix Anthropic models list: use REST API directly (SDK too old for .models)
- Replace test-LLM full analysis with lightweight ping (max_tokens=20)
- Add has_document field to BillDetail; show "No bill text published" state
- Fix "Introduced: —" showing for bills with null introduced_date
- Add bills_missing_sponsor and bills_missing_metadata to admin stats
- Add GovInfo health check using /collections endpoint (fixes 500 from /packages)

Authored-By: Jack Levy

backend/app/workers/llm_processor.py

@@ -199,3 +199,55 @@ def backfill_brief_citations(self):
         return {"total": total, "queued": queued, "skipped": skipped}
     finally:
         db.close()
+
+
+@celery_app.task(bind=True, name="app.workers.llm_processor.resume_pending_analysis")
+def resume_pending_analysis(self):
+    """
+    Two-pass backfill for bills missing analysis:
+
+    Pass 1 — Documents with no brief (LLM tasks failed/timed out):
+      Find BillDocuments that have raw_text but no BillBrief, re-queue LLM.
+
+    Pass 2 — Bills with no document at all:
+      Find Bills with no BillDocument, re-queue document fetch (which will
+      then chain into LLM if text is available on GovInfo).
+    """
+    db = get_sync_db()
+    try:
+        # Pass 1: docs with raw_text but no brief
+        docs_no_brief = db.execute(text("""
+            SELECT bd.id
+            FROM bill_documents bd
+            LEFT JOIN bill_briefs bb ON bb.document_id = bd.id
+            WHERE bb.id IS NULL AND bd.raw_text IS NOT NULL
+        """)).fetchall()
+
+        queued_llm = 0
+        for row in docs_no_brief:
+            process_document_with_llm.delay(row.id)
+            queued_llm += 1
+            time.sleep(0.1)
+
+        # Pass 2: bills with no document at all
+        bills_no_doc = db.execute(text("""
+            SELECT b.bill_id
+            FROM bills b
+            LEFT JOIN bill_documents bd ON bd.bill_id = b.bill_id
+            WHERE bd.id IS NULL
+        """)).fetchall()
+
+        queued_fetch = 0
+        from app.workers.document_fetcher import fetch_bill_documents
+        for row in bills_no_doc:
+            fetch_bill_documents.delay(row.bill_id)
+            queued_fetch += 1
+            time.sleep(0.1)
+
+        logger.info(
+            f"resume_pending_analysis: {queued_llm} LLM tasks queued, "
+            f"{queued_fetch} document fetch tasks queued"
+        )
+        return {"queued_llm": queued_llm, "queued_fetch": queued_fetch}
+    finally:
+        db.close()