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_video_cancel_rust_executor.py

@@ -3,6 +3,7 @@ from __future__ import annotations
 from types import SimpleNamespace
 from unittest.mock import AsyncMock
 
+import httpx
 import pytest
 
 import src.services.task.video.cancel as cancel_mod
@@ -171,3 +172,122 @@ async def test_video_cancel_service_uses_rust_for_gemini_cancel(
     plan = execute_sync.await_args.args[0]
     assert plan.method == "POST"
     assert plan.body.json_body == {}
+
+
+@pytest.mark.asyncio
+async def test_video_cancel_service_returns_503_when_rust_backend_disabled(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    endpoint = SimpleNamespace(
+        id="ep-1",
+        provider_id="prov-1",
+        api_family="openai",
+        endpoint_kind="video",
+        base_url="https://api.openai.com",
+    )
+    key = SimpleNamespace(id="key-1", api_key="encrypted")
+    db = _FakeDB(endpoint, key)
+    service = VideoTaskCancelService(db)
+    task = SimpleNamespace(
+        id="task-1",
+        status=VideoStatus.PROCESSING.value,
+        external_task_id="ext-1",
+        endpoint_id="ep-1",
+        key_id="key-1",
+        request_id="req-1",
+        model="sora-2",
+        completed_at=None,
+        updated_at=None,
+    )
+
+    monkeypatch.setattr(cancel_mod.config, "executor_backend", "python")
+    monkeypatch.setattr(
+        "src.core.crypto.crypto_service.decrypt",
+        lambda value: "upstream-key",
+    )
+    monkeypatch.setattr(
+        "src.core.api_format.build_upstream_headers_for_endpoint",
+        lambda *args, **kwargs: {"authorization": "Bearer upstream-key"},
+    )
+    monkeypatch.setattr(
+        "src.services.provider.transport.build_provider_url",
+        lambda endpoint, is_stream=False, key=None: "https://api.openai.com/v1/videos",
+    )
+    monkeypatch.setattr(
+        "src.clients.http_client.HTTPClientPool.get_default_client_async",
+        AsyncMock(side_effect=AssertionError("python fallback should not run")),
+    )
+
+    response = await service.cancel_task(
+        task=task,
+        task_id="task-1",
+        original_headers={"x-test": "1"},
+    )
+
+    assert isinstance(response, httpx.Response)
+    assert response.status_code == 503
+    assert response.json() == {"error": {"message": "Video 取消仅支持 Rust executor"}}
+    assert db.committed is False
+    assert task.status == VideoStatus.PROCESSING.value
+
+
+@pytest.mark.asyncio
+async def test_video_cancel_service_returns_503_when_rust_executor_unavailable(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    endpoint = SimpleNamespace(
+        id="ep-1",
+        provider_id="prov-1",
+        api_family="gemini",
+        endpoint_kind="video",
+        base_url="https://generativelanguage.googleapis.com",
+    )
+    key = SimpleNamespace(id="key-1", api_key="encrypted")
+    db = _FakeDB(endpoint, key)
+    service = VideoTaskCancelService(db)
+    task = SimpleNamespace(
+        id="task-1",
+        status=VideoStatus.PROCESSING.value,
+        external_task_id="operations/ext-1",
+        endpoint_id="ep-1",
+        key_id="key-1",
+        request_id="req-1",
+        model="veo-3",
+        completed_at=None,
+        updated_at=None,
+    )
+
+    monkeypatch.setattr(cancel_mod.config, "executor_backend", "rust")
+    monkeypatch.setattr(
+        rust_client_mod.RustExecutorClient,
+        "execute_sync_json",
+        AsyncMock(side_effect=rust_client_mod.RustExecutorClientError("executor down")),
+    )
+    monkeypatch.setattr(
+        "src.core.crypto.crypto_service.decrypt",
+        lambda value: "upstream-key",
+    )
+    monkeypatch.setattr(
+        "src.core.api_format.build_upstream_headers_for_endpoint",
+        lambda *args, **kwargs: {"x-goog-api-key": "upstream-key"},
+    )
+    monkeypatch.setattr(
+        "src.services.provider.auth.get_provider_auth",
+        AsyncMock(return_value=None),
+    )
+    monkeypatch.setattr(
+        "src.clients.http_client.HTTPClientPool.get_default_client_async",
+        AsyncMock(side_effect=AssertionError("python fallback should not run")),
+    )
+
+    response = await service.cancel_task(
+        task=task,
+        task_id="task-1",
+        original_headers={"x-test": "1"},
+    )
+
+    assert isinstance(response, httpx.Response)
+    assert response.status_code == 503
+    assert response.json() == {"error": {"message": "执行器暂时不可用，请稍后重试"}}
+    assert db.committed is False
+    assert task.status == VideoStatus.PROCESSING.value