imageFilenames and imageFilename, backend integration tests, frontend tests, removed username references

backend/routes/auth.js

@@ -101,12 +101,14 @@ router.post(
         phone,
       });
 
-      // Link alpha invitation to user
-      await alphaInvitation.update({
-        usedBy: user.id,
-        usedAt: new Date(),
-        status: "active",
-      });
+      // Link alpha invitation to user (only if alpha testing is enabled)
+      if (alphaInvitation) {
+        await alphaInvitation.update({
+          usedBy: user.id,
+          usedAt: new Date(),
+          status: "active",
+        });
+      }
 
       // Generate verification token and send email
       await user.generateVerificationToken();
@@ -367,7 +369,7 @@ router.post(
           lastName,
           authProvider: "google",
           providerId: googleId,
-          profileImage: picture,
+          imageFilename: picture,
           isVerified: true,
           verifiedAt: new Date(),
         });
@@ -434,7 +436,7 @@ router.post(
           email: user.email,
           firstName: user.firstName,
           lastName: user.lastName,
-          profileImage: user.profileImage,
+          imageFilename: user.imageFilename,
           isVerified: user.isVerified,
           role: user.role,
         },