fix: pass appId to /oauth/installedLocations request

The endpoint requires appId (GHL client ID) as a query parameter.
Without it the API returns 422 "appId must be a string".

Co-Authored-By: Paperclip <noreply@paperclip.ing>

internal/ghl/oauth.go

@@ -295,6 +295,7 @@ func (h *OAuthHandler) getCompanyLocations(ctx context.Context, companyAccessTok
 	}
 	q := req.URL.Query()
 	q.Set("companyId", companyID)
+	q.Set("appId", h.clientID)
 	q.Set("isInstalled", "true")
 	req.URL.RawQuery = q.Encode()
 	req.Header.Set("Authorization", "Bearer "+companyAccessToken)