重命名 refs 为 algorithm_subprocesses，并清理误提交的权重与缓存文件。

算法子进程目录仅保留源码与配置；权重、样本 I/O、构建产物通过 .gitignore 离线交付。

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/tests/test_video_batch_runner.py

@@ -272,13 +272,13 @@ def test_build_reference_visualization_command_uses_hand_model_and_result_tsv(
 
 def test_build_reference_command_uses_5_15_main_py(tmp_path: Path) -> None:
     cmd = build_reference_command(
-        bundle_dir=tmp_path / "refs" / "5.15",
+        bundle_dir=tmp_path / "algorithm_subprocesses" / "5.15",
         config_path=tmp_path / "config.yaml",
     )
 
     assert cmd[:3] == ["uv", "run", "python"]
     assert cmd[3:5] == ["-X", "faulthandler"]
-    assert cmd[5].endswith("refs/5.15/main.py")
+    assert cmd[5].endswith("algorithm_subprocesses/5.15/main.py")
     assert cmd[6:] == ["--config", str(tmp_path / "config.yaml")]
 
 
@@ -286,7 +286,7 @@ def test_video_batch_runner_uses_reference_bundle_relative_env_override(
     tmp_path: Path,
     monkeypatch,
 ) -> None:
-    bundle = tmp_path / "refs" / "custom"
+    bundle = tmp_path / "algorithm_subprocesses" / "custom"
     _write_minimal_reference_bundle(bundle)
     video = tmp_path / "case.mp4"
     video.write_bytes(b"same-video")
@@ -305,7 +305,7 @@ def test_video_batch_runner_uses_reference_bundle_relative_env_override(
         output.write_text(_complete_result_tsv_body(), encoding="utf-8")
         return _Proc()
 
-    monkeypatch.setenv("REFERENCE_BUNDLE_RELATIVE", "refs/custom")
+    monkeypatch.setenv("REFERENCE_BUNDLE_RELATIVE", "algorithm_subprocesses/custom")
     monkeypatch.setattr(reference_bundle_runtime, "REPO_ROOT", tmp_path)
     monkeypatch.setattr("app.services.video_batch_runner.subprocess.run", fake_run)