Prepare logseq-mcp for Codex OSS application

[dearcloud09]

Summary

• switch project licensing to MIT for OSS eligibility
• add npm package metadata, bin entrypoint, and package contents
• document Codex, Claude Code, and Claude Desktop MCP setup
• add CI, security policy, contributing guide, changelog, and GraphService regression tests
• harden graph file access against traversal, symlinks, hardlinks, and non-page files
• update vulnerable dependencies and pin safe transitive versions

Verification

• npm test
• npm audit --omit=dev --audit-level=high
• npm pack --dry-run
• MCP startup smoke test with a temporary graph