Enhance backend management and performance tuning

- Introduced remounting logic for data directories to ensure correct bindings before restarting services, improving reliability during performance tuning.
- Added functions to sanitize and ensure absolute paths for backend scripts, preventing issues with relative paths in bind mounts.
- Enhanced the `patch_backends_extra_args` function to clean up corrupted entries and ensure proper configuration of backend parameters.
- Updated tests to validate the new sanitization and path handling functionalities, ensuring robustness in backend management.

tests/test_tune_swarm_perf.py

@@ -176,3 +176,23 @@ def test_sanitize_backends_fds_corruption(tmp_path, monkeypatch):
     monkeypatch.setattr(mod, "BACKENDS", backends)
     assert mod.sanitize_backends_fds() is True
     assert backends.read_text(encoding="utf-8") == "ExtraArgs: --use-sage-attention\n"
+
+
+def test_ensure_absolute_start_script(tmp_path, monkeypatch):
+    mod = _load()
+    data = tmp_path
+    main_py = data / "dlbackend" / "ComfyUI" / "main.py"
+    main_py.parent.mkdir(parents=True)
+    main_py.write_text("# comfy\n", encoding="utf-8")
+    backends = data / "Data" / "Backends.fds"
+    backends.parent.mkdir(parents=True)
+    backends.write_text(
+        "0:\n\ttype: comfyui_selfstart\n\tStartScript: dlbackend/ComfyUI/main.py\n",
+        encoding="utf-8",
+    )
+    monkeypatch.setattr(mod, "DATA", data)
+    monkeypatch.setattr(mod, "BACKENDS", backends)
+    assert mod.ensure_absolute_start_script() is True
+    text = backends.read_text(encoding="utf-8")
+    assert str(main_py.resolve()) in text
+    assert mod.ensure_absolute_start_script() is False