♻️ refactor(command): 配置系统从 SQLite 迁移至 YAML 并修复白名单失效

- 用 CommandConfig dataclass 单例替代模块级变量，解决 from import 造成的本地绑定不随 global 更新的 bug
- 删除 db.py，改用 settings.yaml 存储动态配置，首次启动自动创建并合并 .env 默认值
- 新增文件轮询 watcher（2 秒），检测 YAML 变更自动热重载
- 管理界面 API 改为直接读写 YAML，即时生效
- 依赖 aiosqlite 替换为 pyyaml

uv.lock

@@ -109,15 +109,6 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/fb/76/641ae371508676492379f16e2fa48f4e2c11741bd63c48be4b12a6b09cba/aiosignal-1.4.0-py3-none-any.whl", hash = "sha256:053243f8b92b990551949e63930a839ff0cf0b0ebbe0597b0f3fb19e1a0fe82e", size = 7490, upload-time = "2025-07-03T22:54:42.156Z" },
 ]
 
-[[package]]
-name = "aiosqlite"
-version = "0.22.1"
-source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/4e/8a/64761f4005f17809769d23e518d915db74e6310474e733e3593cfc854ef1/aiosqlite-0.22.1.tar.gz", hash = "sha256:043e0bd78d32888c0a9ca90fc788b38796843360c855a7262a532813133a0650", size = 14821, upload-time = "2025-12-23T19:25:43.997Z" }
-wheels = [
-    { url = "https://files.pythonhosted.org/packages/00/b7/e3bf5133d697a08128598c8d0abc5e16377b51465a33756de24fa7dee953/aiosqlite-0.22.1-py3-none-any.whl", hash = "sha256:21c002eb13823fad740196c5a2e9d8e62f6243bd9e7e4a1f87fb5e44ecb4fceb", size = 17405, upload-time = "2025-12-23T19:25:42.139Z" },
-]
-
 [[package]]
 name = "annotated-types"
 version = "0.7.0"
@@ -918,17 +909,17 @@ version = "0.1.1"
 source = { virtual = "." }
 dependencies = [
     { name = "aiohttp" },
-    { name = "aiosqlite" },
     { name = "ncatbot5" },
     { name = "python-dotenv" },
+    { name = "pyyaml" },
 ]
 
 [package.metadata]
 requires-dist = [
     { name = "aiohttp", specifier = ">=3.9" },
-    { name = "aiosqlite", specifier = ">=0.20" },
     { name = "ncatbot5", specifier = ">=5.5.2.post3" },
     { name = "python-dotenv", specifier = ">=1.0" },
+    { name = "pyyaml", specifier = ">=6.0" },
 ]
 
 [[package]]