1. Add 登陆功能

2. 调整字体大小
3. 新增部分功能

frontend/src/api/auth.ts

@@ -0,0 +1,43 @@
+const AUTH_API_BASE = '/api/v1';
+
+export interface TokenResponse {
+  access_token: string;
+  token_type: string;
+  expires_in: number;
+}
+
+export interface MeResponse {
+  user_id: string;
+  username: string;
+  role: string;
+}
+
+export async function loginRequest(
+  username: string,
+  password: string,
+): Promise<TokenResponse> {
+  const body = new URLSearchParams();
+  body.set('username', username);
+  body.set('password', password);
+
+  const res = await fetch(`${AUTH_API_BASE}/auth/token`, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
+    body: body.toString(),
+  });
+
+  if (!res.ok) {
+    const payload = await res.json().catch(() => ({})) as { detail?: string };
+    throw new Error(payload.detail ?? `Login failed (${res.status})`);
+  }
+
+  return res.json() as Promise<TokenResponse>;
+}
+
+export async function getMeRequest(token: string): Promise<MeResponse> {
+  const res = await fetch(`${AUTH_API_BASE}/auth/me`, {
+    headers: { Authorization: `Bearer ${token}` },
+  });
+  if (!res.ok) throw new Error(`Unauthorised (${res.status})`);
+  return res.json() as Promise<MeResponse>;
+}