feat: VRSub 单体应用（WOV 单机版）初始提交

为视频生成 VR 双眼字幕的单体实现：FastAPI 后端、调度器与全部节点
（提音/转写/翻译/ASS/抽帧/OCR/LLM 过滤）在单进程内运行。

- 节点协议（wov_sdk 数据模型）与分布式版保持一致，预留回退桥梁
- 工作流即数据：DAG 存于 workflows/*.json，模型/链路改动只改数据
- 调度器：拓扑顺序执行、断点续跑（产物重建）、任务暂停/继续
- 抽帧按帧间隔（select 按帧号精确取帧），VLM OCR 与 LLM 过滤使用
  自适应线程池弹性并发，并打印数据处理速度进度日志
- 100% 行覆盖率（pytest --cov-fail-under=100）

tests/test_registry.py

@@ -0,0 +1,116 @@
+"""进程内节点注册表测试。
+
+覆盖节点注册、全量注册、查询、进程内调用以及未注册节点的报错路径，
+验证注册表作为调度器唯一调用入口的正确性。
+"""
+
+import pytest
+
+from wov_app import registry
+from wov_sdk.models import InvokeRequest, InvokeResponse, NodeManifest
+
+
+def _echo_manifest() -> NodeManifest:
+    """构造最小合法 echo 节点清单。"""
+    return NodeManifest(
+        id="echo",
+        name="Echo",
+        version="1.0.0",
+        capability="echo",
+        command=["python", "-m", "echo"],
+        repo_dir="nodes",
+    )
+
+
+def test_register_and_list() -> None:
+    """验证注册后可查询与列出节点，且按 ID 排序。"""
+    registry.register(_echo_manifest(), lambda request: InvokeResponse(status="completed"))
+    registry.register(
+        NodeManifest(
+            id="z-node",
+            name="Z",
+            version="1",
+            capability="x",
+            command=["python", "-m", "z"],
+            repo_dir="nodes",
+        ),
+        lambda request: InvokeResponse(status="completed"),
+    )
+    assert [node.id for node in registry.list_nodes()] == ["echo", "z-node"]
+    assert registry.get_node("echo").capability == "echo"
+    assert registry.get_node("missing") is None
+
+
+def test_register_validation() -> None:
+    """验证非法 manifest 注册会被协议校验拒绝。"""
+    invalid = _echo_manifest()
+    invalid.id = ""
+    with pytest.raises(ValueError):
+        registry.register(invalid, lambda request: InvokeResponse(status="completed"))
+
+
+def test_register_all_loads_builtin_nodes() -> None:
+    """验证 register_all 会加载 manifests/ 下全部内置节点。"""
+    registry.register_all()
+    ids = {node.id for node in registry.list_nodes()}
+    assert {
+        "echo",
+        "ffmpeg-extract",
+        "faster-whisper",
+        "llm-translate",
+        "vlm-ocr",
+        "srt-to-dual-eye-ass",
+    } <= ids
+
+
+def test_invoke_calls_handler() -> None:
+    """验证 invoke 会把请求转发给注册的进程内处理器。"""
+    captured = {}
+
+    def handler(request: InvokeRequest) -> InvokeResponse:
+        captured["run_id"] = request.run_id
+        return InvokeResponse(status="completed", outputs={"text": "ok"})
+
+    registry.register(_echo_manifest(), handler)
+    response = registry.invoke("echo", InvokeRequest(run_id="run_1", node_instance_id=""))
+    assert response.status == "completed"
+    assert response.outputs == {"text": "ok"}
+    assert captured["run_id"] == "run_1"
+
+
+def test_invoke_unknown_node() -> None:
+    """验证调用未注册节点时抛出 ValueError。"""
+    with pytest.raises(ValueError, match="not registered"):
+        registry.invoke("missing", InvokeRequest(run_id="run_1", node_instance_id=""))
+
+
+def test_invoke_logs_node_lifecycle(caplog) -> None:
+    """验证 invoke 会记录节点的开始/完成/耗时日志（主进程可见）。"""
+    registry.register(
+        _echo_manifest(), lambda request: InvokeResponse(status="completed", outputs={"text": "ok"})
+    )
+    with caplog.at_level("INFO", logger="vrsub.node"):
+        registry.invoke("echo", InvokeRequest(run_id="run_1", node_instance_id=""))
+    assert any("节点 echo 开始" in record.message for record in caplog.records)
+    assert any("节点 echo 完成" in record.message for record in caplog.records)
+
+
+def test_invoke_logs_node_failure(caplog) -> None:
+    """验证节点返回 failed 时记录失败日志。"""
+    registry.register(
+        _echo_manifest(), lambda request: InvokeResponse(status="failed", error="boom")
+    )
+    with caplog.at_level("INFO", logger="vrsub.node"):
+        registry.invoke("echo", InvokeRequest(run_id="run_1", node_instance_id=""))
+    assert any("节点 echo 失败" in record.message for record in caplog.records)
+
+
+def test_get_logger_idempotent() -> None:
+    """验证日志器重复获取不会重复附加控制台处理器。"""
+    from wov_app.logging import get_logger
+
+    logger = get_logger("idempotent")
+    handler_count = len(logger.handlers)
+    again = get_logger("idempotent")
+    assert again is logger
+    assert len(again.handlers) == handler_count