feat: Implement rate limiting and environment flag for LLM fallback

add changes for pip package , and improve the frontend ui

feat: complete BYOK migration to frontend localStorage overrides

Add ElaborationCard component and EDALab page for Verilog code testing

Refactor Home Page: Extract HomeComponent, Implement Typewriter Effect, and Update Styles

feat: implement 2 free build limits and BYOK modal

feat: PDF and DOCX stage/full-build reports for HITL and autonomous flow

fix: strict_gates defaults to false, remove dead code

feat: Supabase auth + Razorpay billing + fix API double-URL bug

fix: frontend distinguishes backend-offline vs LLM-key-missing errors

feat: connect frontend to HuggingFace Space backend

feat: add skip coverage option to Design Studio and Human In Loop Build pages

feat(core): integrate core modules, update UI and docs

fix: replace native EventSource with fetchEventSource to bypass ngrok block

fix: Add ngrok bypass header and safe fallbacks to prevent white screen crashes

fix: Remove unused vars to fix Vercel strict TS build

feat: universal chip support, claude theme, and SFT logging export