fix: resolve production UI and API issues

- Fixed backend version endpoint by adding retry logic import
- Gallery login page improvements:
  * Increased title size from text-xl to text-2xl (responsive scaling)
  * Title now uses event's custom primary color (var(--color-primary))
  * Removed event category badge from login page
- Fixed Umami analytics configuration check:
  * Added proper enabled state tracking
  * Warning now only shows when Umami is explicitly not configured
  * Checks both admin settings and environment variables properly

These changes improve user experience and fix false warnings in production.

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

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

backend/src/routes/adminSystem.js

@@ -1,5 +1,5 @@
 const express = require('express');
-const { db } = require('../database/db');
+const { db, withRetry } = require('../database/db');
 const { adminAuth } = require('../middleware/auth-enhanced-v2');
 const fs = require('fs').promises;
 const path = require('path');