chore(release): publish as real-browser-cli

- Rename the PyPI distribution from browser-cli to real-browser-cli after PyPI rejected the original name as too similar to an existing project.
- Keep the installed console command as browser-cli so user-facing CLI usage remains unchanged.
- Add README-based package metadata, author information, and project URLs so PyPI renders a proper project description.
- Centralize the PyPI distribution name for importlib.metadata version lookups used by the CLI, doctor command, and remote user agent.
- Document uv tool install, optional fast extra installation, and upgrade commands.
- Bump package and extension metadata to 0.14.3 for the republished release.

browser_cli/cli.py

@@ -35,6 +35,7 @@ from browser_cli.commands.serve_http import cmd_serve_http
 from browser_cli.commands.watch import watch_group
 from browser_cli.commands.workspace import workspace_group
 from browser_cli.commands.raw import cmd_command
+from browser_cli.constants import PYPI_PACKAGE_NAME
 
 console = Console()
 
@@ -63,7 +64,7 @@ def _project_version() -> str:
     pass
 
   try:
-    return package_version("browser-cli")
+    return package_version(PYPI_PACKAGE_NAME)
   except PackageNotFoundError:
     return "unknown"