Pin SDK to 4.44.1 + monkey-patch gradio_client schema bool TypeError

The HF ZeroGPU image hardcodes gradio[oauth]==4.44.1, so we can't bump
gradio. The bug ('const' in <bool> in get_type) is patched at import
time by replacing gradio_client.utils.get_type and _json_schema_to_python_type
with bool-tolerant wrappers.

README.md

@@ -4,7 +4,7 @@ emoji: 🎭
 colorFrom: red
 colorTo: indigo
 sdk: gradio
-sdk_version: 5.7.1
+sdk_version: 4.44.1
 app_file: app.py
 pinned: true
 license: other

app.py

@@ -11,8 +11,32 @@ import sys
 import tempfile
 import time
 
-import gradio as gr
-import spaces
+# Workaround gradio_client 1.3.0 bug: get_type/json_schema_to_python_type crash when
+# a JSON schema field (e.g. additionalProperties) is a bool literal instead of a dict.
+# Patching has to happen BEFORE `import gradio` triggers the schema walk on launch.
+import gradio_client.utils as _gcu  # noqa: E402
+
+_orig_get_type = _gcu.get_type
+_orig_json_to_py = _gcu._json_schema_to_python_type
+
+
+def _safe_get_type(schema):
+    if not isinstance(schema, dict):
+        return "Any"
+    return _orig_get_type(schema)
+
+
+def _safe_json_to_py(schema, defs=None):
+    if not isinstance(schema, dict):
+        return "Any"
+    return _orig_json_to_py(schema, defs)
+
+
+_gcu.get_type = _safe_get_type
+_gcu._json_schema_to_python_type = _safe_json_to_py
+
+import gradio as gr  # noqa: E402
+import spaces  # noqa: E402
 
 # Local src import.
 sys.path.insert(0, os.path.join(os.path.dirname(os.path.abspath(__file__)), "src"))

requirements.txt

@@ -11,8 +11,6 @@ sentencepiece>=0.1.99
 transformers>=4.45.0
 huggingface_hub>=0.20.0,<1.0
 bitsandbytes>=0.43.0
-gradio>=5.0.0
-gradio-client>=1.5.0
 spaces>=0.30.0
 soundfile>=0.12.0
 resemble-perth @ git+https://github.com/resemble-ai/Perth.git@master