hotfix: hard-coded URL for chat in dashboard (#15)

Co-authored-by: Sharang Parnerkar <parnerkarsharang@gmail.com>
Reviewed-on: #15

src/models/user.rs

@@ -22,6 +22,8 @@ pub struct AuthInfo {
     pub name: String,
     /// Avatar URL (from Keycloak picture claim)
     pub avatar_url: String,
+    /// LibreChat instance URL for the sidebar chat link
+    pub librechat_url: String,
 }
 
 /// Per-user LLM provider configuration stored in MongoDB.