docs: update CLI commands to use python -m rf_mapper

- Replace rf-mapper with python -m rf_mapper throughout docs
- Add note about activating venv first
- Updated: CLAUDE.md, PROJECT.md, USAGE.md, CHEATSHEET.md, HOME_ASSISTANT.md

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -43,11 +43,12 @@ src/rf_mapper/
 
 ```bash
 source venv/bin/activate
-rf-mapper start        # Start web server (background)
-rf-mapper status       # Check if running
-rf-mapper stop         # Stop server
-rf-mapper scan -l room # CLI scan
-rf-mapper --help       # All commands
+python -m rf_mapper start        # Start web server (background)
+python -m rf_mapper status       # Check if running
+python -m rf_mapper stop         # Stop server
+python -m rf_mapper restart      # Restart server
+python -m rf_mapper scan -l room # CLI scan
+python -m rf_mapper --help       # All commands
 ```
 
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