docs: add hardware specifications to highlight build small constraints

docs: add hackathon track and achievement tags

docs: add model switching and sqlite fts5 explanations

feat: enhance UI, fix timezone, improve vision agent and email extraction, update README

Add timeout and HF Spaces warning for IMAP connection

Fix ZeroGPU crash by adding @spaces.GPU decorators

Pin fastapi and starlette for Gradio 4 compatibility

Pin huggingface-hub<0.27.0 to fix Gradio import error

Remove llama-cpp-python to fix build hang

Add competition tags

Fix README metadata color

Initial commit for Hugging Face