feat(auth): add profile update and password change endpoints; enhance provider list handling

app/models/user.py

@@ -67,6 +67,13 @@ class User(db.Model):
     
     def to_dict(self) -> dict:
         """Convert user to dictionary."""
+        # Build comprehensive providers list
+        providers = [provider.provider for provider in self.oauth_providers]
+        if self.password_hash:
+            providers.append("password")
+        if self.api_token:
+            providers.append("api_token")
+            
         return {
             "id": str(self.id),
             "email": self.email,
@@ -76,7 +83,7 @@ class User(db.Model):
             "is_active": self.is_active,
             "api_token": self.api_token,
             "api_token_expires_at": self.api_token_expires_at.isoformat() if self.api_token_expires_at else None,
-            "providers": [provider.provider for provider in self.oauth_providers],
+            "providers": providers,
             "plan": self.plan.to_dict() if self.plan else None,
             "credits": self.credits,
             "created_at": self.created_at.isoformat(),