feat: remove browser integration and chrome-devtools-mcp support

[sorrycc]

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[augmentcode]

🤖 Augment PR Summary

Summary: This PR removes the CLI/browser integration that enabled the Chrome DevTools MCP server.

Changes:

• Removed the Chrome DevTools MCP entrypoint under mcps/ and dropped the chrome-devtools-mcp dependency.
• Removed the browser config option and its associated MCP server merge logic.
• Removed the --browser CLI flag and stopped passing it into runtime config.
• Updated the build pipeline to no longer bundle MCPs (removed build:mcps from build).
• Simplified Biome configuration by removing now-unneeded browser-specific exclusions/overrides.

Technical Notes: After this change, Chrome DevTools MCP will no longer be auto-registered via configuration, and builds will no longer emit bundled MCP artifacts.

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