Fix broken dropdown serialization in cpu-basic wrapper

app.py

@@ -7,35 +7,37 @@ from mineru.cli.gradio_app import main as mineru_gradio
 
 OUTPUT_ROOT = Path("/tmp/mineru-space-output")
 CPU_SAFE_BACKENDS = ["pipeline"]
+GPU_BACKENDS = {"pipeline", "vlm-auto-engine", "hybrid-auto-engine"}
+
+
+def enforce_cpu_space_defaults(demo: gr.Blocks) -> None:
+    for block in demo.blocks.values():
+        if isinstance(block, gr.Dropdown):
+            raw_choices = list(getattr(block, "choices", []) or [])
+            normalized = {
+                choice[1] if isinstance(choice, (tuple, list)) and len(choice) >= 2 else choice
+                for choice in raw_choices
+            }
+            if GPU_BACKENDS.issubset(normalized):
+                block.choices = [(name, name) for name in CPU_SAFE_BACKENDS]
+                block.value = "pipeline"
+                block.info = (
+                    "Traditional Multi-model pipeline parsing, supports multiple "
+                    "languages, hallucination-free."
+                )
+                continue
 
 
 def patch_gradio_defaults() -> None:
-    original_dropdown_init = gr.Dropdown.__init__
     original_launch = gr.Blocks.launch
 
-    def patched_dropdown_init(self, *args, **kwargs):
-        choices = kwargs.get("choices")
-        value = kwargs.get("value")
-
-        if (
-            isinstance(choices, list)
-            and {"pipeline", "vlm-auto-engine", "hybrid-auto-engine"}.issubset(
-                set(choices)
-            )
-            and value == "hybrid-auto-engine"
-        ):
-            kwargs["choices"] = CPU_SAFE_BACKENDS
-            kwargs["value"] = "pipeline"
-
-        return original_dropdown_init(self, *args, **kwargs)
-
     def patched_launch(self, *args, **kwargs):
         # HF Spaces can mis-detect localhost accessibility under Gradio 5 SSR.
+        enforce_cpu_space_defaults(self)
         kwargs.setdefault("ssr_mode", False)
         kwargs.setdefault("show_error", True)
         return original_launch(self, *args, **kwargs)
 
-    gr.Dropdown.__init__ = patched_dropdown_init
     gr.Blocks.launch = patched_launch