fix: resolve multiple production issues

- Fix archive page showing "00" instead of "0" for empty photo counts
- Fix email queue PostgreSQL "updated_at" column error with migration and fallback
- Fix storage calculation discrepancies between system status and archive pages
- Add proper storage info to system status endpoint
- Fix archive path concatenation in settings endpoint

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

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

frontend/src/services/settings.service.ts

@@ -47,6 +47,11 @@ export interface SystemStatus {
       activityLogs: number;
     };
   };
+  storage: {
+    totalUsed: number;
+    photoStorage: number;
+    archiveStorage: number;
+  };
   emailQueue: {
     pending: number;
     sent: number;