reused grpc connections, not a constant refreshes anymore, all fixed now, keep on fixing other bugs

client/src/services/auth.rs

@@ -14,12 +14,20 @@ pub struct AuthClient {
 
 impl AuthClient {
     pub async fn new() -> Result<Self> {
+        // Kept for backward compatibility; opens a new connection.
         let client = AuthServiceClient::connect("http://[::1]:50051")
             .await
             .context("Failed to connect to auth service")?;
         Ok(Self { client })
     }
 
+    /// Preferred: reuse an existing Channel (from GrpcClient).
+    pub async fn with_channel(channel: Channel) -> Result<Self> {
+        Ok(Self {
+            client: AuthServiceClient::new(channel),
+        })
+    }    
+
     /// Login user via gRPC.
     pub async fn login(&mut self, identifier: String, password: String) -> Result<LoginResponse> {
         let request = tonic::Request::new(LoginRequest { identifier, password });