feat(center): issue per-guild tokens and add introspection API

src/auth/auth.controller.ts

@@ -1,4 +1,4 @@
-import { Body, Controller, Post } from '@nestjs/common';
+import { Body, Controller, Get, Headers, Post, UnauthorizedException } from '@nestjs/common';
 import { AuthService } from './auth.service';
 import { RegisterDto } from './dto.register.dto';
 import { LoginDto } from './dto.login.dto';
@@ -28,4 +28,19 @@ export class AuthController {
   logout(@Body() body: LogoutDto) {
     return this.authService.logout(body.refreshToken);
   }
+
+  @Get('me/guilds')
+  meGuilds(@Headers('authorization') authorization?: string) {
+    const token = authorization?.startsWith('Bearer ') ? authorization.slice(7) : '';
+    if (!token) throw new UnauthorizedException('missing bearer token');
+    return this.authService.listMyGuilds(token);
+  }
+
+  @Post('introspect')
+  introspect(
+    @Body() body: { token?: string; guildNodeId?: string },
+    @Headers('x-center-shared-secret') sharedSecret?: string,
+  ) {
+    return this.authService.introspectGuildToken(body?.token ?? '', body?.guildNodeId ?? '', sharedSecret);
+  }
 }