Replace panic with error handling in connector handlers

The connector initiate and complete HTTP handlers used panic for
operational errors (network, DB, provider failures). No recovery
middleware exists on the console chi router, so these panics
produced incomplete responses instead of proper HTTP 500 errors.

Use the same log-and-render pattern already established in
loadExistingConnector error handling.

Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>

pkg/server/api/console/v1/connector_initiate.go

@@ -116,7 +116,9 @@ func handleConnectorInitiate(
 
 		redirectURL, err := connectorRegistry.Initiate(r.Context(), provider, organizationID, opts, r)
 		if err != nil {
-			panic(fmt.Errorf("cannot initiate connector: %w", err))
+			logger.ErrorCtx(r.Context(), "cannot initiate connector", log.Error(err))
+			httpserver.RenderError(w, http.StatusInternalServerError, fmt.Errorf("internal error"))
+			return
 		}
 
 		http.Redirect(w, r, redirectURL, http.StatusSeeOther)
@@ -158,4 +160,3 @@ func loadExistingConnector(
 	}
 	return found, err
 }
-