feat: 扩展 Rust gateway 全功能模块，新增 billing/crypto/wallet crate 及完整数据层

- 新增 aether-billing、aether-crypto、aether-wallet 独立 crate
- aether-data 扩展 repository 层：announcements、auth_modules、billing、
  candidate_selection、gemini_file_mappings、global_models、management_tokens、
  oauth_providers、proxy_nodes、quota、users、wallet 等模块
- aether-gateway 新增 api/auth/billing/control/middleware/scheduler/usage/
  video_tasks/hooks/maintenance/model_fetch/provider_transport 等功能模块
- 重构 executor decision 和 gateway state 为模块目录结构
- 新增 gateway router、frontdoor 路由层及对应测试
- Python 侧 API 路由重构，新增 compat/support 模块
- 前端 Logo 组件更新及 Provider 管理页面调整

tests/services/test_vertex_auth.py

@@ -23,7 +23,7 @@ class _TimeoutAsyncClient:
 
 
 @pytest.mark.asyncio
-async def test_vertex_auth_timeout_error_includes_readable_message(
+async def test_vertex_auth_is_rust_only(
     monkeypatch: pytest.MonkeyPatch,
 ) -> None:
     service = VertexAuthService(
@@ -39,5 +39,5 @@ async def test_vertex_auth_timeout_error_includes_readable_message(
     monkeypatch.setattr(service, "_create_jwt", lambda: "signed-jwt")
     monkeypatch.setattr("src.core.vertex_auth.httpx.AsyncClient", _TimeoutAsyncClient)
 
-    with pytest.raises(VertexAuthError, match=r"request timed out after 30s"):
+    with pytest.raises(VertexAuthError, match=r"仅支持 Rust executor"):
         await service.get_access_token(httpx_client_kwargs={"timeout": 30})