feat(tasks): Add unified task-based worker architecture

Replace fragmented job systems (job_schedules, dispensary_crawl_jobs, SyncOrchestrator)
with a single unified task queue:

- Add worker_tasks table with atomic task claiming via SELECT FOR UPDATE SKIP LOCKED
- Add TaskService for CRUD, claiming, and capacity metrics
- Add TaskWorker with role-based handlers (resync, discovery, analytics)
- Add /api/tasks endpoints for management and migration from legacy systems
- Add TasksDashboard UI and integrate task counts into main dashboard
- Add comprehensive documentation

Task roles: store_discovery, entry_point_discovery, product_discovery, product_resync, analytics_refresh

Run workers with: WORKER_ROLE=product_resync npx tsx src/tasks/task-worker.ts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/src/index.ts

@@ -139,6 +139,7 @@ import eventsRoutes from './routes/events';
 import clickAnalyticsRoutes from './routes/click-analytics';
 import seoRoutes from './routes/seo';
 import priceAnalyticsRoutes from './routes/price-analytics';
+import tasksRoutes from './routes/tasks';
 
 // Mark requests from trusted domains (cannaiq.co, findagram.co, findadispo.com)
 // These domains can access the API without authentication
@@ -211,6 +212,10 @@ app.use('/api/monitor', workersRoutes);
 app.use('/api/job-queue', jobQueueRoutes);
 console.log('[Workers] Routes registered at /api/workers, /api/monitor, and /api/job-queue');
 
+// Task queue management - worker tasks with capacity planning
+app.use('/api/tasks', tasksRoutes);
+console.log('[Tasks] Routes registered at /api/tasks');
+
 // Phase 3: Analytics V2 - Enhanced analytics with rec/med state segmentation
 try {
   const analyticsV2Router = createAnalyticsV2Router(getPool());