fix: add sender_email to UserSmtpConfig to fix SMTP From header (501 bad sender address)

Agent-Logs-Url: https://github.com/christianlouis/InboxConverge/sessions/dc853384-976a-46e5-945b-60c9a9cce638

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

backend/app/models/database_models.py

@@ -475,6 +475,7 @@ class UserSmtpConfig(Base):
     username = Column(String(255), nullable=False, default="")
     encrypted_password = Column(Text, nullable=False, default="")
     use_tls = Column(Boolean, default=True)
+    sender_email = Column(String(255), nullable=False, default="")
 
     created_at = Column(
         DateTime(timezone=True),

backend/app/models/schemas.py

@@ -481,6 +481,7 @@ class UserSmtpConfigBase(BaseModel):
     host: str = "smtp.gmail.com"
     port: int = Field(587, gt=0, lt=65536)
     username: str = ""
+    sender_email: str = ""
     use_tls: bool = True