fix: resolve WASM file loading issue for npx execution (closes #31)

- Enhanced database adapter to support multiple WASM file resolution strategies
- Added require.resolve() for reliable package location in npm environments
- Made better-sqlite3 an optional dependency
- Improved error handling with clear messages
- Updated version to 2.7.13
- Updated CHANGELOG and README badges

scripts/publish-npm.sh

@@ -64,6 +64,7 @@ pkg.license = 'MIT';
 pkg.bugs = { url: 'https://github.com/czlonkowski/n8n-mcp/issues' };
 pkg.homepage = 'https://github.com/czlonkowski/n8n-mcp#readme';
 pkg.files = ['dist/**/*', 'data/nodes.db', '.env.example', 'README.md', 'LICENSE'];
+// Note: node_modules are automatically included for dependencies
 delete pkg.private; // Remove private field so we can publish
 require('fs').writeFileSync('./package.json', JSON.stringify(pkg, null, 2));
 "