feat: add AI render mode with SDXL + ControlNet Tile inpainting

fix: use starlette CORS middleware instead of gradio kwarg

fix: enable CORS for cross-origin frontend access

fix: use float32 for Mask2Former (float16 causes numerical collapse)

fix: switch to Mask2Former Swin-L (more robust than OneFormer)

fix: auto-detect floor class IDs from model config, add debug logging

fix: cast inputs to float16 to match model dtype

fix: add scipy dependency for OneFormer

fix: load models on CPU at startup for Zero GPU compatibility

fix: disable SSR, add @spaces.GPU decorator for Zero GPU

feat: initial tile visualizer API with OneFormer + Depth Anything V2

initial commit