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/types.ts

@@ -123,6 +123,7 @@ export interface BillDetail extends Bill {
   news_articles: NewsArticle[];
   trend_scores: TrendScore[];
   briefs: BriefSchema[];
+  has_document: boolean;
 }
 
 export interface PaginatedResponse<T> {
@@ -153,3 +154,10 @@ export interface SettingsData {
   newsapi_enabled: boolean;
   pytrends_enabled: boolean;
 }
+
+export interface NotificationSettings {
+  ntfy_topic_url: string;
+  ntfy_token: string;
+  ntfy_enabled: boolean;
+  rss_token: string | null;
+}