fix: jwt token issue

src/app/services/tournament-auth.service.ts

@@ -0,0 +1,55 @@
+import { Injectable } from '@angular/core';
+
+interface RegisterResponse {
+  id: string;
+  token: string;
+}
+
+@Injectable({ providedIn: 'root' })
+export class TournamentAuthService {
+  private readonly inflight = new Map<string, Promise<string>>();
+
+  async getToken(serverUrl: string): Promise<string> {
+    const key = this.cacheKey(serverUrl);
+    const cached = localStorage.getItem(key);
+    if (cached) return cached;
+
+    const existing = this.inflight.get(key);
+    if (existing) return existing;
+
+    const promise = this.register(serverUrl)
+      .then(token => {
+        localStorage.setItem(key, token);
+        this.inflight.delete(key);
+        return token;
+      })
+      .catch(err => {
+        this.inflight.delete(key);
+        throw err;
+      });
+
+    this.inflight.set(key, promise);
+    return promise;
+  }
+
+  clearToken(serverUrl: string): void {
+    localStorage.removeItem(this.cacheKey(serverUrl));
+  }
+
+  private async register(serverUrl: string): Promise<string> {
+    const base = serverUrl.replace(/\/+$/, '');
+    const localName = localStorage.getItem('username') ?? 'viewer';
+    const res = await fetch(`${base}/api/auth/register`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ name: `${localName}-watch`, isBot: false })
+    });
+    if (!res.ok) throw new Error(`tournament-server register failed: ${res.status}`);
+    const body = (await res.json()) as RegisterResponse;
+    return body.token;
+  }
+
+  private cacheKey(serverUrl: string): string {
+    return `tournament-token:${serverUrl.replace(/\/+$/, '')}`;
+  }
+}