fix: Nginx POST /auth/login redirect to CMS

- Add map to detect POST requests to /auth/login
- Redirect POST /auth/login to CMS service (port 3001)
- Keep GET /auth/login on frontend (port 3000)

AI Status:
- Ollama server (t-800.norteamericano.cl:11434) not accessible from AWS EC2
- Connection timeout - need to open port 11434 or use public IP

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

nginx/proxy.conf

@@ -3,3 +3,9 @@ map $http_x_forwarded_proto $origin_proto {
     default $http_x_forwarded_proto;
     ""      $scheme;
 }
+
+# Map to detect POST to /auth/login
+map "$request_uri:$request_method" $cms_login {
+    default 0;
+    "~^/auth/login$:POST" 1;
+}