feat(huya): 整合 App 协议登录获取 Cookie 全链路并与 Web 登录解耦

- core/huya: 新增 app_login, wup_encoder, nonce_forge, cert_forge, envelope_forge, device_profile, udb_aes
- core/huya/__init__.py: 导出 login_huya_app_password 与 HuyaAppPasswordLogin
- web/backend: 新增 /accounts/app-password-login 与 /accounts/app-password-login/selected 路由及 Schema，与原 Web 密码登录独立分开
- web/frontend: 增加 App 登录 API 与前端界面“App 登录选中”操作，弹窗结果明确区分
- tests: 新增 test_huya_app_login.py 单元测试覆盖全链路

web/backend/schemas.py

@@ -261,13 +261,21 @@ class HuyaCookieImport(BaseModel):
 
 
 class HuyaPasswordLoginRequest(BaseModel):
-    """虎牙账号密码登录并保存 Cookie。"""
+    """虎牙账号 Web 密码登录并保存 Cookie（旧版）。"""
     username: str = Field(..., min_length=1, max_length=128)
     password: str = Field(..., min_length=1, max_length=128)
     tag: str = ""
     cookie: str = ""
 
 
+class HuyaAppPasswordLoginRequest(BaseModel):
+    """虎牙账号 App 协议密码登录并保存 Cookie（推荐）。"""
+    username: str = Field(..., min_length=1, max_length=128)
+    password: str = Field(..., min_length=1, max_length=128)
+    tag: str = ""
+    force_new_device: bool = False
+
+
 class HuyaSmsCodeRequest(BaseModel):
     """发送虎牙短信验证码。"""
     phone: str = Field(..., min_length=5, max_length=32)
@@ -386,6 +394,7 @@ class HuyaPasswordLoginSelectedRequest(BaseModel):
     tag: str = ""
     assigned_only: bool = False
     has_cookie: bool = False
+    force_new_device: bool = False
 
 
 class HuyaAccountOut(BaseModel):