feat(routes): 迁移账号/全局歌单端点 + 鉴权依赖测试

迁移路由（/api/v1/*，与 Flask 同端点逐字段对齐）：
- account/vip：admin/user 双路径 + 5 分钟缓存（降级结果 30s），
  VIP 探测单飞锁与 Flask 同源跨栈共享；未登录可访问（同 Flask）
- global/playlists、global/playlist：管理员闸（require_admin，403 对齐）
- web/deps.py 新增 require_admin；_resolve_user_cookies 支持可选用户（匿名审计保底）

测试：46/46（新增 10 项鉴权依赖：有效/管理员/封禁/禁用/顶号/伪造 Cookie、
401/403 闸）；ruff All checks passed；pyright 0 errors。

契约奇偶校验：16 项全 OK（新增 account:vip、global:playlists/playlist、
非管理员 403）；uvicorn 实跑双栈 account/vip 均 200、未授权歌单 403。

tests/test_deps.py

@@ -0,0 +1,90 @@
+# -*- coding: utf-8 -*-
+"""FastAPI 鉴权依赖测试：会话解析、封禁/顶号拒绝、登录与管理员闸。"""
+import sqlite3
+import time
+
+import pytest
+
+import core.db as db
+from core import session as cs
+from web.deps import SiteUser, current_user, require_admin, require_login
+from web.errors import AppError
+
+SECRET = 'deps-test-secret'
+
+
+@pytest.fixture()
+def site(tmp_path, monkeypatch):
+    path = tmp_path / 'site.db'
+    conn = sqlite3.connect(str(path))
+    conn.executescript("""
+        CREATE TABLE users (id INTEGER PRIMARY KEY, username TEXT, role TEXT DEFAULT 'user',
+                            status INTEGER DEFAULT 1, login_seq INTEGER DEFAULT 0,
+                            duration_seconds INTEGER DEFAULT 0, ban_reason TEXT DEFAULT '');
+        INSERT INTO users (id, username, role, status, login_seq, duration_seconds)
+            VALUES (1,'qfbsh','admin',1,376,-1),
+                   (26,'normal','user',1,5,97),
+                   (27,'banned','user',2,1,0),
+                   (28,'disabled','user',0,1,0);
+    """)
+    conn.commit()
+    conn.close()
+    monkeypatch.setattr(db, 'DATA_DIR', tmp_path)
+    monkeypatch.setattr(db, 'DB_PATH', path)
+    monkeypatch.setattr('web.deps.secret_key', lambda: SECRET)
+    return path
+
+
+def _cookie(uid, seq, ts=None):
+    return cs.dumps(SECRET, {'site_uid': uid, 'site_uid_seq': seq,
+                             'site_uid_ts': ts or int(time.time())})
+
+
+async def test_valid_user(site):
+    u = await current_user(_cookie(26, 5))
+    assert u is not None and u.id == 26 and u.username == 'normal'
+    assert not u.is_admin and not u.unlimited
+
+
+async def test_admin_unlimited(site):
+    u = await current_user(_cookie(1, 376))
+    assert u is not None and u.is_admin and u.unlimited
+
+
+async def test_missing_cookie(site):
+    assert await current_user(None) is None
+
+
+async def test_banned_rejected(site):
+    assert await current_user(_cookie(27, 1)) is None
+
+
+async def test_disabled_rejected(site):
+    assert await current_user(_cookie(28, 1)) is None
+
+
+async def test_stale_login_seq_rejected(site):
+    """顶号：会话版本与库不一致 → 视为未登录。"""
+    assert await current_user(_cookie(26, 4)) is None
+
+
+async def test_forged_cookie_rejected(site):
+    assert await current_user('not-a-valid-cookie') is None
+
+
+async def test_require_login_raises(site):
+    with pytest.raises(AppError) as ei:
+        await require_login(None)
+    assert ei.value.status_code == 401
+
+
+async def test_require_admin_forbidden_for_user(site):
+    u = SiteUser(id=26, username='normal', role='user', credits=97)
+    with pytest.raises(AppError) as ei:
+        await require_admin(u)
+    assert ei.value.status_code == 403
+
+
+async def test_require_admin_ok(site):
+    u = SiteUser(id=1, username='qfbsh', role='admin', credits=-1)
+    assert (await require_admin(u)).is_admin