chore: import upstream snapshot with attribution

.env.example

@@ -0,0 +1,23 @@
+TRIPO_API_KEY=your_tripo_api_key
+TRIPO_MODEL_VERSION=v3.0-20250812
+TRIPO_API_BASE=https://api.tripo3d.ai/v2/openapi
+RODIN_API_KEY=your_rodin_api_key
+RODIN_API_BASE=https://api.hyper3d.com/api/v2
+RODIN_TIER=Gen-2
+RODIN_QUALITY=medium
+RODIN_MESH_MODE=Raw
+RODIN_MATERIAL=PBR
+FAL_API_KEY=your_fal_api_key
+FAL_DEFAULT_MODEL=fal-ai/hunyuan3d/v2
+VISION_PROVIDER=openai
+OPENAI_API_KEY=your_openai_api_key
+OPENAI_API_BASE=https://api.openai.com/v1
+OPENAI_VISION_MODEL=gpt-4o-mini
+HUNYUAN_API_BASE=http://127.0.0.1:8081
+HUNYUAN_CREATE_PATH=/send
+HUNYUAN_STATUS_PATH=/status
+API_PORT=8787
+API_HOST=127.0.0.1
+LOCAL_MODEL_DIR=.generated-models
+LOG_DIR=.logs
+LOG_FILE=3d-model-studio-api.log