Enhance authentication handling

inventory-server/auth/server.js

@@ -123,7 +123,12 @@ app.get('/me', async (req, res) => {
     }
     
     const user = userResult.rows[0];
-    
+
+    // Check if user is active
+    if (!user.is_active) {
+      return res.status(403).json({ error: 'Account is inactive' });
+    }
+
     // Get user permissions
     let permissions = [];
     if (!user.is_admin) {