remove frontedn_url from env and use app url insteaad in reset pwd mail

.env.build.develop

@@ -2,4 +2,3 @@ PORT=3000
 APP_URL=https://develop.fusionbills.com/
 AI_SERVICE_URL=http://ai:8000/api/v1 
 NODE_ENV=development
-FRONTEND_URL=https://develop.fusionbills.com

src/controllers/auth.controller.ts

@@ -71,7 +71,7 @@ export const forgotPassword = async (req: Request, res: Response) => {
             reset_token: resetToken,
             reset_token_expiry: resetTokenExpiry
         });
-        const resetLink = `${process.env.FRONTEND_URL}/reset-password?token=${resetToken}`;
+        const resetLink = `${process.env.APP_URL}reset-password?token=${resetToken}`;
 
         sendMail({
             subject: 'Your password reset link',
@@ -159,4 +159,4 @@ export const changePassword = async (req: AuthenticatedRequest, res: Response) =
         logger.error("Error changing password: ", error);
         return res.status(500).json({ error: 'Internal server error' });
     }
-}
+}