Add request logging middleware for pod log visibility

- Add gunicorn access/error log options to Dockerfile
- Create RequestLoggingMiddleware for detailed request logging
- Log request method, path, host, IP, NHN headers, response status, duration

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

nhn_prj/middleware.py

@@ -0,0 +1,53 @@
+# nhn_prj/middleware.py
+import logging
+import time
+
+logger = logging.getLogger(__name__)
+
+
+class RequestLoggingMiddleware:
+    """모든 요청을 로깅하는 미들웨어"""
+
+    def __init__(self, get_response):
+        self.get_response = get_response
+
+    def __call__(self, request):
+        # 요청 시작 시간
+        start_time = time.time()
+
+        # 요청 정보 로깅
+        logger.info(
+            f"[REQUEST] {request.method} {request.path} "
+            f"| Host: {request.get_host()} "
+            f"| IP: {self.get_client_ip(request)}"
+        )
+
+        # 헤더 로깅 (디버깅용)
+        nhn_headers = {
+            k: v for k, v in request.headers.items()
+            if k.lower().startswith('x-nhn')
+        }
+        if nhn_headers:
+            logger.info(f"[HEADERS] NHN Headers: {nhn_headers}")
+
+        # 응답 처리
+        response = self.get_response(request)
+
+        # 응답 시간 계산
+        duration = time.time() - start_time
+
+        # 응답 정보 로깅
+        logger.info(
+            f"[RESPONSE] {request.method} {request.path} "
+            f"| Status: {response.status_code} "
+            f"| Duration: {duration:.3f}s"
+        )
+
+        return response
+
+    def get_client_ip(self, request):
+        """클라이언트 IP 추출"""
+        x_forwarded_for = request.META.get('HTTP_X_FORWARDED_FOR')
+        if x_forwarded_for:
+            return x_forwarded_for.split(',')[0].strip()
+        return request.META.get('REMOTE_ADDR', 'unknown')