feat(server): 支持 Granian 与 rloop/uvloop/winloop 事件循环

- 新增 scripts/serve.py 启动器：server auto/uvicorn/granian，循环可用性与平台校验（显式不可用直接报错）
- pyproject 增加 granian 可选 extra（granian[reload,rloop,uvloop,winloop]，平台 marker 由 granian 维护）
- tests/test_serve.py 覆盖服务器/循环选择与命令拼装；README 补充启动方式、循环矩阵与多 worker 限制

uv.lock

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+]
+
+[package.optional-dependencies]
+reload = [
+    { name = "watchfiles" },
+]
+rloop = [
+    { name = "rloop", marker = "sys_platform != 'win32'" },
+]
+uvloop = [
+    { name = "uvloop", marker = "platform_python_implementation == 'CPython' and sys_platform != 'win32'" },
+]
+winloop = [
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+
 [[package]]
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 version = "0.16.0"
@@ -388,6 +423,11 @@ dependencies = [
     { name = "uvicorn", extra = ["standard"] },
 ]
 
+[package.optional-dependencies]
+granian = [
+    { name = "granian", extra = ["reload", "rloop", "uvloop", "winloop"] },
+]
+
 [package.dev-dependencies]
 dev = [
     { name = "httpx" },
@@ -403,10 +443,12 @@ requires-dist = [
     { name = "brotli", specifier = ">=1.1" },
     { name = "cryptography", specifier = ">=43" },
     { name = "fastapi", specifier = ">=0.115" },
+    { name = "granian", extras = ["reload", "rloop", "uvloop", "winloop"], marker = "extra == 'granian'", specifier = ">=2.0" },
     { name = "pillow", specifier = ">=10" },
     { name = "qrcode", specifier = ">=8" },
     { name = "uvicorn", extras = ["standard"], specifier = ">=0.30" },
 ]
+provides-extras = ["granian"]
 
 [package.metadata.requires-dev]
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