feat(phase1): core/ 基础设施迁移，旧路径改垫片

- core/: database/redis_client/jwt/password/response/exceptions/security/logger/deps/middleware/app
- create_app 迁移到 core/app.py，中间件注册顺序与异常处理器原样保留
- extensions/ utils/ apps/ 旧文件全部改为 re-export 垫片，import 路径保持兼容
- 新增 core 单元测试（jwt/password/response/request 共 12 个）

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

core/response.py

@@ -0,0 +1,84 @@
+# +======================================================================
+# | DjangoAdmin 企业数字化开发平台 [ 赋能开发者，助力企业发展 ]
+# +----------------------------------------------------------------------
+# | Copyright (c) 2021-2026 一米阳光团队 版权所有
+# | 开源协议: Apache-2.0
+# +======================================================================
+# 由 utils/response.py 迁移而来。
+
+"""统一响应结果模块：所有 API 返回 {code, data, msg, ok} 标准格式。"""
+
+from typing import Any, Optional, Dict
+
+from starlette.responses import JSONResponse
+
+# 默认提示消息（避免从 apps.constants 循环导入）
+MESSAGE_OK = "操作成功"
+MESSAGE_FAIL = "操作失败"
+
+
+def ok(
+        data: Optional[Any] = None,
+        msg: str = MESSAGE_OK,
+        code: int = 0,
+        **kwargs: Any
+) -> JSONResponse:
+    """生成成功响应，支持通过 kwargs 添加额外字段（如 count）。"""
+    response_body: Dict[str, Any] = {
+        "code": code,
+        "data": data,
+        "msg": msg,
+        "ok": True
+    }
+    if kwargs:
+        response_body.update(kwargs)
+    return JSONResponse(response_body)
+
+
+def failed(
+        msg: str = MESSAGE_FAIL,
+        code: int = 1,
+        data: Optional[Any] = None,
+        **kwargs: Any
+) -> JSONResponse:
+    """生成失败响应。"""
+    response_body: Dict[str, Any] = {
+        "code": code,
+        "data": data,
+        "msg": msg,
+        "ok": False
+    }
+    if kwargs:
+        response_body.update(kwargs)
+    return JSONResponse(response_body)
+
+
+def response(
+        data: Optional[Any] = None,
+        msg: str = MESSAGE_OK,
+        code: int = 0,
+        success: bool = True,
+        **kwargs: Any
+) -> JSONResponse:
+    """通用响应生成器（高级用法），允许完全自定义字段。"""
+    response_body: Dict[str, Any] = {
+        "code": code,
+        "data": data,
+        "msg": msg,
+        "ok": success
+    }
+    if kwargs:
+        response_body.update(kwargs)
+    return JSONResponse(response_body)
+
+
+# 常用错误码常量
+class Codes:
+    """常用状态码定义"""
+    SUCCESS = 0
+    FAILED = 1
+    UNAUTHORIZED = 401  # 未认证
+    FORBIDDEN = 403  # 无权限
+    NOT_FOUND = 404  # 资源不存在
+    VALIDATE_ERROR = 422  # 验证错误
+    SERVER_ERROR = 500  # 服务器错误