fix: make NotificationConfigBase.name optional with default 'My Notification' to match DB default

Agent-Logs-Url: https://github.com/christianlouis/InboxConverge/sessions/7640aaa6-61f4-4c65-8eb7-f33c2d3eb755

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

backend/app/models/schemas.py

@@ -290,7 +290,9 @@ class PaginatedAdminLogsResponse(BaseModel):
 # Notification Config Schemas
 class NotificationConfigBase(BaseModel):
     name: str = Field(
-        ..., max_length=255, description="Friendly name for this notification channel"
+        default="My Notification",
+        max_length=255,
+        description="Friendly name for this notification channel",
     )
     channel: NotificationChannel
     apprise_url: Optional[str] = Field(None, description="Apprise notification URL")