fix(config): set default values for SMTP configuration

- Provide default values for SMTP settings
- Initialize required SMTP parameters for safer startup

Author: Lcwei-0708

backend/core/config.py

@@ -64,13 +64,13 @@ class Settings(BaseSettings):
 
     # SMTP setting
     SMTP_ENABLE: bool = False
-    SMTP_HOST: str
-    SMTP_PORT: int
-    SMTP_USERNAME: str
-    SMTP_PASSWORD: str
-    SMTP_FROM_EMAIL: str
-    SMTP_FROM_NAME: str
-    SMTP_ENCRYPTION: str
+    SMTP_HOST: str = "smtp.gmail.com"
+    SMTP_PORT: int = 587
+    SMTP_USERNAME: str = ""
+    SMTP_PASSWORD: str = ""
+    SMTP_FROM_EMAIL: str = ""
+    SMTP_FROM_NAME: str = "Docker Fullstack Template"
+    SMTP_ENCRYPTION: str = "tls"
 
     # Default admin user settings
     DEFAULT_ADMIN_EMAIL: str = "admin@example.com"