fix(spaces): use \$HOME instead of /data (no persistent-storage add-on needed)

HF Pro grants ZeroGPU minutes but persistent storage at /data is a
separate paid add-on. Without it /data is unwritable, which crashed the
Space at startup. Switching the Spaces clone target and models dir to
~/comfyui — \$HOME is writable, and ZeroGPU containers freeze on sleep
rather than tear down, so the clone effectively persists across calls
within a single deploy.

app.py

@@ -49,7 +49,11 @@ def _git_clone(url: str, dst: pathlib.Path, ref: str) -> None:
 
 def _bootstrap() -> None:
     on_spaces = _on_spaces()
-    comfy_dir = pathlib.Path("/data/comfyui" if on_spaces else "comfyui")
+    # /data requires the paid persistent-storage add-on (separate from Pro).
+    # Without it, /data is unwritable. $HOME is writable and — because ZeroGPU
+    # containers freeze on sleep rather than tear down — the clone persists
+    # across calls within a single deploy.
+    comfy_dir = (pathlib.Path.home() / "comfyui") if on_spaces else pathlib.Path("comfyui")
 
     if on_spaces and not comfy_dir.exists():
         print(f"[bootstrap] cold start on Spaces; cloning ComfyUI to {comfy_dir}", flush=True)
@@ -73,10 +77,7 @@ def _bootstrap() -> None:
 
     if str(comfy_dir) not in sys.path:
         sys.path.insert(0, str(comfy_dir))
-    os.environ.setdefault(
-        "COMFY_MODELS_DIR",
-        str(pathlib.Path("/data/models") if on_spaces else (comfy_dir / "models")),
-    )
+    os.environ.setdefault("COMFY_MODELS_DIR", str(comfy_dir / "models"))
 
     # Stage placeholder input files so the workflow's hard-referenced loaders
     # (LoadImage/VHS_Load*) don't error at runtime even when the active mode

backend.py

@@ -160,7 +160,7 @@ class _StubPromptServerInstance:
 
 def _comfy_dir() -> pathlib.Path:
     if _on_spaces():
-        return pathlib.Path("/data/comfyui")
+        return pathlib.Path.home() / "comfyui"
     return pathlib.Path(__file__).parent / "comfyui"
 
 

models.py

@@ -216,7 +216,7 @@ def _comfy_models_dir() -> pathlib.Path:
     if raw:
         return pathlib.Path(raw)
     if _on_spaces():
-        return pathlib.Path("/data/models")
+        return pathlib.Path.home() / "comfyui" / "models"
     return pathlib.Path(__file__).parent / "comfyui" / "models"
 
 
@@ -224,8 +224,8 @@ def ensure_models(filenames: set[str]) -> Iterator[DownloadEvent]:
     """Ensure each requested model is materialized in comfyui/models/<type>/.
 
     Local mode: hf_hub_download into the user's HF cache; symlink to comfyui/models/.
-    Spaces mode: hf_hub_download with cache_dir=/data; comfyui/models/ symlinks
-    point into /data.
+    Spaces mode: hf_hub_download with cache_dir under $HOME (no /data dependency);
+    files staged at ~/comfyui/models/<comfy_type>/<filename>.
 
     Files not in MODEL_REGISTRY are skipped (with a warning) — useful when the
     workflow has been manually customized with non-canonical filenames that the