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

frontend/lib/api.ts

@@ -137,6 +137,19 @@ export interface AdminUser {
   created_at: string;
 }
 
+export interface ApiHealthResult {
+  status: "ok" | "error" | "skipped";
+  detail: string;
+  latency_ms?: number;
+}
+
+export interface ApiHealth {
+  congress_gov: ApiHealthResult;
+  govinfo: ApiHealthResult;
+  newsapi: ApiHealthResult;
+  google_news: ApiHealthResult;
+}
+
 export interface AnalysisStats {
   total_bills: number;
   docs_fetched: number;
@@ -144,6 +157,10 @@ export interface AnalysisStats {
   full_briefs: number;
   amendment_briefs: number;
   uncited_briefs: number;
+  no_text_bills: number;
+  pending_llm: number;
+  bills_missing_sponsor: number;
+  bills_missing_metadata: number;
   remaining: number;
 }
 
@@ -182,6 +199,12 @@ export const adminAPI = {
     apiClient.post("/api/admin/backfill-citations").then((r) => r.data),
   triggerFetchActions: () =>
     apiClient.post("/api/admin/trigger-fetch-actions").then((r) => r.data),
+  backfillMetadata: () =>
+    apiClient.post("/api/admin/backfill-metadata").then((r) => r.data),
+  resumeAnalysis: () =>
+    apiClient.post("/api/admin/resume-analysis").then((r) => r.data),
+  getApiHealth: () =>
+    apiClient.get<ApiHealth>("/api/admin/api-health").then((r) => r.data),
   getTaskStatus: (taskId: string) =>
     apiClient.get(`/api/admin/task-status/${taskId}`).then((r) => r.data),
 };