fix: silence noisy backend logs + fix gemini key field name

fix: 12-point production audit — bugs, security, perf, reliability

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

fix: serve dashboard.html with try_files instead of alias

feat: custom dashboard at / and route DeerFlow under /app

feat: restructure to HuggingClaw architecture with dashboard + Cloudflare features

init: HuggingDeer — DeerFlow on Hugging Face Spaces