chore: remove ServiceLink integration

- Drop the ServiceLink submodule, link-serve command, and serve --rpc mode.
- Remove the now-unused httpx dependency and regenerate uv.lock.
- Add a privacy policy for Chrome Web Store publication.
- Refresh extension icons and bump package/extension version to 0.14.2.
- Keep the native TCP serve path as the only remote-control endpoint.

browser_cli/cli.py

@@ -23,7 +23,6 @@ from browser_cli.commands.storage import storage_group
 from browser_cli.commands.perf import perf_group
 from browser_cli.commands.extension import extension_group
 from browser_cli.commands.serve import cmd_serve
-from browser_cli.commands.link_serve import cmd_link_serve
 from browser_cli.commands.auth import auth_group
 from browser_cli.commands.clients import clients_group
 from browser_cli.commands.completion import cmd_completion
@@ -128,7 +127,6 @@ main.add_command(storage_group)
 main.add_command(perf_group)
 main.add_command(extension_group)
 main.add_command(cmd_serve)
-main.add_command(cmd_link_serve)
 main.add_command(clients_group)
 main.add_command(cmd_completion)
 main.add_command(cmd_install)