🐛 修复一些类型错误

nonebot_bison/admin_page/__init__.py

@@ -52,7 +52,7 @@ def init_fastapi():
         app.mount("/bison", nonebot_app, "nonebot-bison")
 
     driver = get_driver()
-    register_router_fastapi(driver, socket_app)
+    register_router_fastapi(driver, socket_app)  # type: ignore
     host = str(driver.config.host)
     port = driver.config.port
     if host in ["0.0.0.0", "127.0.0.1"]:

nonebot_bison/post/custom_post.py

@@ -11,7 +11,7 @@ from .abstract_post import BasePost, AbstractPost
 @dataclass
 class _CustomPost(BasePost):
     ms_factories: list[MessageSegmentFactory] = field(default_factory=list)
-    css_path: str | None = None  # 模板文件所用css路径
+    css_path: str = ""  # 模板文件所用css路径
 
     async def generate_text_messages(self) -> list[MessageSegmentFactory]:
         return self.ms_factories