fix: Health-Check vereinfacht – kein DB-Query mehr bei /health

Verhindert unnötige SELECT 1 Abfragen gegen Supabase alle 30s.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/src/index.ts

@@ -6,7 +6,6 @@ import rateLimit from 'express-rate-limit';
 
 import { staffbaseAuth as createStaffbaseAuth } from './middleware/staffbaseAuth';
 import { devAuth } from './middleware/devAuth';
-import { checkDbConnection } from './db/client';
 import { logger } from './services/logger';
 
 import matchesRouter from './routes/matches';
@@ -110,11 +109,9 @@ app.use(
 // ============================================================
 // Health Check (ohne Auth – für Railway/Render/Uptime-Monitoring)
 // ============================================================
-app.get('/health', async (_req, res) => {
-  const dbOk = await checkDbConnection();
-  res.status(dbOk ? 200 : 503).json({
-    status: dbOk ? 'ok' : 'degraded',
-    db: dbOk ? 'connected' : 'unreachable',
+app.get('/health', (_req, res) => {
+  res.status(200).json({
+    status: 'ok',
     timestamp: new Date().toISOString(),
     version: process.env.npm_package_version ?? '1.0.0',
   });