feat: Auto-migrations on startup, worker exit location, proxy improvements

- Add auto-migration system that runs SQL files from migrations/ on server startup
- Track applied migrations in schema_migrations table
- Show proxy exit location in Workers dashboard
- Add "Cleanup Stale" button to remove old workers
- Add remove button for individual workers
- Include proxy location (city, state, country) in worker heartbeats
- Update Proxy interface with location fields
- Re-enable bulk proxy import without ON CONFLICT

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

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

backend/src/index.ts

@@ -6,6 +6,8 @@ import { initializeMinio, isMinioEnabled } from './utils/minio';
 import { initializeImageStorage } from './utils/image-storage';
 import { logger } from './services/logger';
 import { cleanupOrphanedJobs } from './services/proxyTestQueue';
+import { runAutoMigrations } from './db/auto-migrate';
+import { getPool } from './db/pool';
 import healthRoutes from './routes/health';
 import imageProxyRoutes from './routes/image-proxy';
 
@@ -307,6 +309,17 @@ async function startServer() {
   try {
     logger.info('system', 'Starting server...');
 
+    // Run auto-migrations before anything else
+    const pool = getPool();
+    const migrationsApplied = await runAutoMigrations(pool);
+    if (migrationsApplied > 0) {
+      logger.info('system', `Applied ${migrationsApplied} database migrations`);
+    } else if (migrationsApplied === 0) {
+      logger.info('system', 'Database schema up to date');
+    } else {
+      logger.warn('system', 'Some migrations failed - check logs');
+    }
+
     await initializeMinio();
     await initializeImageStorage();
     logger.info('system', isMinioEnabled() ? 'MinIO storage initialized' : 'Local filesystem storage initialized');