fix: derive MCP server version from package metadata

[mawxcodehub]

Summary

• Read the MCP server version from package metadata instead of a hardcoded 1.0.0 literal.
• Keeps the server initialization version aligned with the package version on future releases.

Closes #12

Validation

• npm run build
• npm pack --dry-run --json
• node -e "const fs=require('fs'); const pkg=require('./package.json'); const js=fs.readFileSync('./dist/index.js','utf8'); if(!js.includes('package_json_1.default.version')) process.exit(1); console.log(JSON.stringify({packageVersion:pkg.version, usesPackageVersion: true}))"
• git diff --check