refactor: simplify manager to Tavily-only, harden registrars

feat: edit keys, feishu notifications, simplified CI, Exa OTP fix

feat: add proxy support to Firecrawl & Exa registrars + manager multi-service updates

feat: add Firecrawl + Exa multi-service support

ui: use icon.png for favicon, login logo and navbar mark

feat: add full Tavily API alignment (crawl, map, research, usage)

design: redesign login logo and background color scheme

fix: larger centered paper-plane logo (80px, full cursor shape)

fix: paper-plane logo, Auth0 signup flow for new identifier-first login

fix: logo redesign, proxy body auth for Cherry Studio, correct MCP docs

chore: add .gitignore to hf_space

feat: v3.1 — quota checking, dark UI redesign, registration fixes, daily CI