Improve ONNX setup: proactive VC++/AVX2 checks, friendlier errors, post-install verification

web_interface: improve onnxruntime load-failure recovery

Fix run.bat: convert LF to CRLF line endings so CMD parses commands correctly

launcher: portable Python fallback + auto-install VC++ runtime

web_interface: fix run.bat fallback + UTF-8 console handling

Add web interface (Gradio launcher + run.bat)