fix: correct HF Space URL + add health endpoint + frontend retry/warmup UX

backend/main.py

@@ -57,6 +57,14 @@ class TranslationResponse(BaseModel):
 async def root():
     return {"message": "SignBridge AI API is running"}
 
+@app.get("/health")
+async def health():
+    return {
+        "status": "ready" if model.is_loaded else "loading",
+        "model_loaded": model.is_loaded,
+        "error": model._load_error
+    }
+
 @app.post("/translate", response_model=TranslationResponse)
 async def translate_text(request: TranslationRequest):
     try:

backend/model_loader.py

@@ -104,7 +104,8 @@ class SignModel:
             
             render_skeleton_to_video(skeletons, output_path, mode="standard")
             
-            video_url = f"https://explowebsite-sign-idd-inference.hf.space/static/{filename}"
+            space_base_url = os.environ.get("HF_SPACE_URL", "https://explowebsite-sign-idd-inference.hf.space")
+            video_url = f"{space_base_url}/static/{filename}"
             
             return {
                 "skeletons": None,