refactor: add type hints to function signatures across multiple files

app/services/auth.py

@@ -25,7 +25,7 @@ async def verify_jwt(request: Request, token: str) -> bool:
 
 
 class AuthBearer(HTTPBearer):
-    def __init__(self, auto_error: bool = True):
+    def __init__(self, auto_error: bool = True) -> None:
         super().__init__(auto_error=auto_error)
 
     async def __call__(self, request: Request):

app/services/llm.py

@@ -5,7 +5,7 @@ import orjson
 
 
 class StreamLLMService:
-    def __init__(self, base_url: str = "http://localhost:11434/v1"):
+    def __init__(self, base_url: str = "http://localhost:11434/v1") -> None:
         self.base_url = base_url
         self.model = "llama3.2"
 

app/services/smtp.py

@@ -45,7 +45,7 @@ class SMTPEmailService(metaclass=SingletonMetaNoArgs):
     )
     server: smtplib.SMTP = field(init=False)  # Deferred initialization in post-init
 
-    def __attrs_post_init__(self):
+    def __attrs_post_init__(self) -> None:
         """
         Initializes the SMTP server connection after the object is created.
 
@@ -98,7 +98,7 @@ class SMTPEmailService(metaclass=SingletonMetaNoArgs):
         subject: str,
         body_text: str = "",
         body_html: str = None,
-    ):
+    ) -> None:
         """
         Sends an email to the specified recipients.
 
@@ -130,7 +130,7 @@ class SMTPEmailService(metaclass=SingletonMetaNoArgs):
         template: str,
         context: dict,
         sender: EmailStr,
-    ):
+    ) -> None:
         """
         Sends an email using a Jinja2 template.