feat: return PNG by default for LLM compatibility, add SVG-specific tools

feat: add drawing style picker with font and sloppiness options to read_me

fix: correct relative link to DEPLOYMENT.md

docs: simplify and deduplicate documentation

fix: allow reverse proxy Host header and inject base URL into all tools

fix: auto-detect base URL from request headers for reverse proxy

update: update read_me for mcp

feat: add --base-url flag and document basic workflow

fix: resolve all npm install warnings and 7 vulnerabilities

chore: add package-lock.json for reproducible builds

docs: document single-domain deployment with --static flag

fix: add landing page for sidecar mode, avoid chat LLM config prompt

feat: add --static flag for single-port deployment without nginx

docs: rewrite all documentation with deploy and usage focus

docs: rewrite README for excalidraw-sidecar-mcp