fix: point MCP development exports to published files

[Pugsin]

Summary

• point the @codeagora/mcp development export conditions at the same published JS files as import
• avoid resolving package exports to unpublished TypeScript source files

Why

@codeagora/mcp@0.1.2 publishes dist/index.js and dist/version.js, but not src/index.ts or src/version.ts. Consumers/tools running with the development condition can resolve those missing source files from the published package.

Validation

• npm pack @codeagora/mcp@0.1.2 --silent confirmed package/src/index.ts and package/src/version.ts are absent while package/dist/index.js and package/dist/version.js exist
• node -e "const p=require('./packages/mcp/package.json'); if(p.exports['.'].development!=='./dist/index.js') process.exit(1); if(p.exports['./version.js'].development!=='./dist/version.js') process.exit(2)"
• git diff --check