fix(nginx): Route /api/sentry-tunnel to Next.js frontend

Sentry Tunnel is a Next.js API Route, not FastAPI endpoint.
Must be handled by frontend server to avoid 404.

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

k8s/nginx/awoooi-prod.conf

@@ -68,7 +68,20 @@ server {
     }
 
     # ============================================
-    # 一般 API 路由
+    # Next.js API Routes (前端處理)
+    # ⚠️ 必須在 /api/ 之前，否則會被後端攔截
+    # ============================================
+    location /api/sentry-tunnel {
+        proxy_pass http://awoooi_prod_web;
+
+        proxy_http_version 1.1;
+        proxy_set_header Connection "keep-alive";
+        proxy_read_timeout 30s;
+        proxy_send_timeout 30s;
+    }
+
+    # ============================================
+    # 一般 API 路由 (FastAPI 後端)
     # ============================================
     location /api/ {
         proxy_pass http://awoooi_prod_api;