docs: add duplicate space button, secrets frontmatter, support section

chore: production-readiness pass — add missing release files, clean up code

feat: dynamic dashboard at / + rewrite README following HuggingClip style

rename: HuggingDeer → HuggingFlow

fix: add HF Spaces YAML metadata to README

init: HuggingDeer — DeerFlow on Hugging Face Spaces