chore(config): Make Nacos namespace configurable

- Replace hardcoded public namespace with NACOS_NAMESPACE
- Document nacos init container troubleshooting for 1Panel deploy

backend/video-gateway/src/main/resources/application-prod.yml

@@ -14,7 +14,7 @@ spring:
     nacos:
       discovery:
         server-addr: ${NACOS_HOST:nacos}:${NACOS_PORT:8848}
-        namespace: public
+        namespace: ${NACOS_NAMESPACE:}
         group: DEFAULT_GROUP
         # 移除以下健康检查配置
         # heart-beat-interval: 5000

backend/video-gateway/src/main/resources/bootstrap.yml

@@ -5,7 +5,7 @@ spring:
     nacos:
       discovery:
         server-addr: ${NACOS_HOST:nacos}:${NACOS_PORT:8848}
-        namespace: public
+        namespace: ${NACOS_NAMESPACE:}
         group: DEFAULT_GROUP
         username: ${NACOS_USERNAME:nacos}
         password: ${NACOS_PASSWORD:nacos}
@@ -19,8 +19,8 @@ spring:
         register-enabled: true
       config:
         server-addr: ${NACOS_HOST:nacos}:${NACOS_PORT:8848}
-        namespace: public
+        namespace: ${NACOS_NAMESPACE:}
         group: DEFAULT_GROUP
         username: ${NACOS_USERNAME:nacos}
         password: ${NACOS_PASSWORD:nacos}
-        file-extension: yaml
+        file-extension: yaml