feat: use metro config from plugin-metro; make config optional

[thymikee]

Summary

• Remove metro.config.js from plugin-metro template - projects now work out of the box without it
• Re-export getDefaultConfig and mergeConfig from @rock-js/plugin-metro for easy customization
• When no config exists, use defaults from @react-native/metro-config instead of throwing an error

Usage (when customization needed):

const { getDefaultConfig, mergeConfig } = require('@rock-js/plugin-metro');
/**
 * @type {import('@rock-js/plugin-metro').MetroConfig}
 */
module.exports = mergeConfig(getDefaultConfig(__dirname), { /* overrides */ });

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Project	Deployment	Review	Updated (UTC)
rock	Ready	Preview, Comment	Jan 20, 2026 7:33pm