docs: use neutral English examples

[Mathieu2301]

Summary

• replace French household vocabulary in public guides, examples, templates, and test fixtures with neutral English names
• rename the component example from salon to living-room
• keep the bundled CLI guide byte-for-byte aligned with its source

Verification

• bun run check (311 tests)
• bun run check:packages (CLI 123, component 38, template 8)
• git diff --check