debug: capture full stack trace on fatal startup error

apps/api/src/index.ts

@@ -378,8 +378,13 @@ const start = async () => {
         startCleanupCron();
         
         logger.info('[STARTUP] Background services initialized.');
-    } catch (err) {
-        logger.error('[STARTUP] FATAL ERROR:', err);
+    } catch (err: any) {
+        logger.error('[STARTUP] ❌ FATAL ERROR DURING STARTUP:');
+        logger.error(err.message || String(err));
+        if (err.stack) logger.error(err.stack);
+        
+        // Ensure logs are flushed
+        console.error('CRITICAL STARTUP ERROR:', err);
         process.exit(1);
     }
 };