Part of #3979. Migrates the last few stragglers that still used print() directly: hf extensions install, hf extensions remove, hf lfs-enable-largefiles, and hf version.

• hf extensions install → out.result("<Type> extension installed", source=..., command=...) + an out.hint("Run it with: hf <name>") for the follow-up.
• hf extensions remove → out.result("Extension removed", name=...).
• hf lfs-enable-largefiles → out.result("Local repo set up for largefiles", path=...).
• hf version (the subcommand) → out.result("hf version", version=...). The global --version flag in hf.py keeps its raw print(__version__) because it fires as an eager Typer callback before out is set up.

hf extensions ls and hf extensions search were already migrated in #4057 — this PR just cleans up the leftover write paths in the same module.

Examples

$ hf version
✓ hf version
  version: 1.17.0.dev0

$ hf version --format json
{"version": "1.17.0.dev0"}

$ hf version --format quiet
1.17.0.dev0

$ hf version --format agent
version=1.17.0.dev0

$ hf lfs-enable-largefiles ./my-repo
✓ Local repo set up for largefiles
  path: /Users/celina/my-repo

$ hf lfs-enable-largefiles ./my-repo --format json
{"path": "/Users/celina/my-repo"}

$ hf extensions install gradio-app/hf-gradio
✓ Python extension installed
  source: gradio-app/hf-gradio
  command: hf gradio
Hint: Run it with: hf gradio

$ hf extensions remove gradio
✓ Extension removed
  name: gradio