feat(browser): fetch Playwright driver bundle from Maven at runtime

[alexk-dev]

Summary

• remove driver-bundle from application packaging so the fat JAR does not embed Playwright browser bundles
• add PlaywrightDriverBundleService that resolves the current Playwright version from classpath and downloads driver-bundle-{version}.jar from Maven Central (hardcoded trusted hosts) when needed
• store downloaded bundles under ${bot.update.updates-path}/playwright-driver/bundles and extracted installs under ${bot.update.updates-path}/playwright-driver/installs/{version}/{platform} while keeping old versions
• wire driver preparation into startup (AutoConfiguration) and browser lazy init (PlaywrightAdapter) by setting playwright.cli.dir to the installed path
• add unit tests for download/extract flow, reuse of installed driver, and retention of older bundle jars

[sonarqubecloud]

Quality Gate failed

Failed conditions
78.2% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud