feat(phase4): 全部业务模块迁移到 modules/（结构迁移）

- 21 个模块目录（auth/system/dictionary/configuration/cms/member/region/link/notice/job/log/upload/index）
- 每个模块 router.py（合并模块导出多个 router）/schemas.py/service.py/repository.py/models.py
- routers/v1.py 与 routers/__init__.py 改为直接引用 modules，前缀与权限串原样保留
- core/middleware.py 懒加载指向 modules.system.menu / modules.log；core/redis_client.py 指向 modules.job.scheduler
- apps/views|services|forms 全部改为 re-export 垫片
- 迁移后 grep 守门通过：modules/core 无 apps/extensions 残留引用
- 实测登录、27+ 模块接口、写操作 commit、操作日志落库均正常

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

apps/forms/city.py

@@ -1,18 +1,2 @@
-from typing import Optional
-
-from pydantic import BaseModel, Field
-
-
-# 城市表单验证
-class CityForm(BaseModel):
-    id: Optional[int] = Field(None, description="城市ID")
-    name: str = Field(..., min_length=1, max_length=150, description="城市名称")
-    short_name: str = Field(..., min_length=1, max_length=150, description="城市简称")
-    pinyin: str = Field(..., min_length=1, max_length=150, description="城市拼音")
-    city_code: str = Field(..., min_length=1, max_length=6, description="城市区号")
-    area_code: str = Field(..., min_length=1, max_length=20, description="行政编码")
-    zip_code: str = Field(..., min_length=1, max_length=6, description="城市邮编")
-    level: int = Field(..., ge=1, le=4, description="城市级别")
-    lng: str = Field(..., min_length=1, max_length=150, description="城市经度")
-    lat: str = Field(..., min_length=1, max_length=150, description="城市纬度")
-    pid: Optional[int] = Field(None, description="上级ID")
+# 兼容垫片：由 modules.region.schemas 迁移
+from modules.region.schemas import *  # noqa: F401,F403