fix: auto-derive API credentials on startup, fix signature_type for proxy wallets

Update `.env.example` with example values and refine market queries to explicitly exclude closed markets.

docs: add project completion summary

feat: comprehensive accessibility improvements - all phases complete

fix: correct indentation after rate limiter refactor

fix: correct rate limiter context manager usage

fix: remove duplicate json imports inside functions

fix: add missing json imports in tools modules

fix: enable read-only mode when API credentials unavailable

fix: correct realtime tools function name

chore: remove unnecessary internal documentation files

docs: update community links to official websites

docs: add final publication documentation

docs: add community sharing guidelines and GitHub setup instructions

Initial commit: Polymarket MCP Server v0.1.0