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_provider_transport_codex.py

@@ -79,6 +79,22 @@ def test_codex_openai_cli_does_not_duplicate_responses_suffix() -> None:
     assert url == "https://chatgpt.com/backend-api/codex/responses"
 
 
+def test_codex_openai_cli_supports_backendapi_variant() -> None:
+    endpoint = _DummyEndpoint(
+        base_url="https://chatgpt.com/backendapi/codex",
+        api_format="openai:cli",
+        provider=SimpleNamespace(provider_type="codex"),
+    )
+
+    url = build_provider_url(
+        endpoint,  # type: ignore[arg-type]
+        path_params={"model": "ignored"},
+        is_stream=True,
+    )
+
+    assert url == "https://chatgpt.com/backendapi/codex/responses"
+
+
 def test_codex_openai_cli_uses_compact_suffix_when_context_marked_compact() -> None:
     endpoint = _DummyEndpoint(
         base_url="https://chatgpt.com/backend-api/codex",