feat: full format compatibility adaptation for model downloads

- Add get_model_urls() and download_model() to api.py and api_complete.py
  supporting all 14 discovered urlResult format keys (glb, obj, pbr maps, etc.)
- Update generator.py to extract full urlResult dict instead of just modelUrl
- Add CLI subcommands: formats (list available formats) and download (fetch by key)
- Update reverse engineering docs with complete format key table and CLI examples

README_REVERSE_ENGINEERING.md

@@ -131,6 +131,16 @@ api = Hunyuan3DAPIComplete()
 result = api.generate_from_image(resource_url, title="My Model")
 ```
 
+### 4. CLI Download
+
+```bash
+# List available formats for a creation
+hunyuan3dweb formats <creation_id>
+
+# Download a specific format (default: glb)
+hunyuan3dweb download <creation_id> --format glb -o model.glb
+```
+
 ---
 
 ## API Endpoints
@@ -150,6 +160,27 @@ result = api.generate_from_image(resource_url, title="My Model")
 | Global config | GET | `/config` | Query params |
 | Animation templates | GET | `/workflow/action/templates` | Query params |
 
+### Model Download Formats
+
+The `urlResult` field in `/creations/detail` contains up to 14 format keys:
+
+| Key | Description |
+|-----|-------------|
+| `glb` | GLB binary model with PBR textures |
+| `obj` | OBJ model (usually zipped) |
+| `mtl` | MTL material file |
+| `obj_url` | Standalone OBJ file URL |
+| `geometryGlb` | Geometry-only GLB (no materials) |
+| `textureGlb` | GLB texture pack |
+| `textureObj` | OBJ texture pack |
+| `image_url` | Preview / thumbnail image |
+| `pbrImage` | Combined PBR texture map |
+| `pbrMetallicImage` | PBR metallic map |
+| `pbrRoughnessImage` | PBR roughness map |
+| `pbrNormalImage` | PBR normal map |
+| `invisible_wall` | Invisible collision wall |
+| `air_wall` | Air wall (collision body) |
+
 ---
 
 ## Technical Details