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>

modules/auth/router.py

@@ -0,0 +1,31 @@
+from fastapi import APIRouter, Request
+
+from modules.auth.schemas import LoginForm
+from modules.auth import service as login
+from core import R
+from utils.captcha import generate_captcha
+
+# 创建路由
+router = APIRouter()
+
+
+# 系统登录
+@router.post('/login', summary='系统登录')
+async def do_login(request: Request, data: LoginForm):
+    result = await login.login(request, data)
+    return result
+
+
+# 获取验证码
+@router.get('/captcha', summary='获取验证码')
+async def captcha(request: Request):
+    # 生成验证码
+    result = await generate_captcha(request)
+    # idKey值
+    idKey = result['idKey']
+    # 验证码base64字符串
+    data = result['data']
+    # 将图片转换为base64
+    imgStr = "data:image/png;base64," + data
+    # 返回结果
+    return R.ok(idkey=idKey, data=imgStr)