refactor(center): introspect relies on api key auth instead of shared secret

src/auth/auth.service.ts

@@ -1,7 +1,6 @@
 import {
   ConflictException,
   Injectable,
-  ForbiddenException,
   UnauthorizedException,
 } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
@@ -175,12 +174,7 @@ export class AuthService {
     }
   }
 
-  async introspectGuildToken(token: string, guildNodeId: string, sharedSecret?: string) {
-    const expectedSecret = process.env.CENTER_SHARED_SECRET as string;
-    if (!sharedSecret || sharedSecret !== expectedSecret) {
-      throw new ForbiddenException('invalid shared secret');
-    }
-
+  async introspectGuildToken(token: string, guildNodeId: string) {
     let payload: jwt.JwtPayload;
     try {
       payload = jwt.verify(token, process.env.JWT_ACCESS_SECRET as string) as jwt.JwtPayload;