fix: use POST method instead of GET for the '/oauth/callback'

Author: yaroslav8765

custom/OAuthCallback.vue

@@ -49,7 +49,7 @@ onMounted(async () => {
     const encodedState = encodeURIComponent(state);
     const response = await callAdminForthApi({
       path: `/oauth/callback?code=${encodedCode}&state=${encodedState}&redirect_uri=${redirectUri}`,
-      method: 'GET',
+      method: 'POST',
     });
     
     if (response.allowedLogin) {

index.ts

@@ -151,7 +151,7 @@ export default class OAuthPlugin extends AdminForthPlugin {
 
   setupEndpoints(server: IHttpServer) {
     server.endpoint({
-      method: 'GET',
+      method: 'POST',
       path: '/oauth/callback',
       noAuth: true,
       handler: async ({ query, response, headers, cookies, requestUrl }) => {