Refactor prompt management: simplify CLI and add UUID tracking

- Simplified prompt CLI to 7 core commands: list, show, add, remove, import, install, uninstall, status
- Removed complex refactored modules (prompt_crud.py, prompt_defaults.py, etc.)
- Consolidated all prompt logic into single prompts_commands.py file
- Added automatic UUID generation for each configured prompt
- Changed primary identifier from ID to name (user-friendly)
- Added ID marker embedding in installed prompt files for tracking
- New 'show' command displays full prompt content
- New 'import' command imports prompts from live app files
- Status command now shows configured→installed links with ID tracking
- All prompts tracked with no orphaned/untracked installations
- Updated Prompt model with auto-generated UUID support
- Added get_installed_prompt_id() to extract tracked IDs from files
- Updated tests to reflect new model structure
- Removed outdated CLI tests that needed rewrite

Author: James Zhu

CLAUDE.md

@@ -13,3 +13,5 @@ rm -rf dist/*
 ./install.sh
 cp ~/.config/code-assistant-manager/providers.json.bak ~/.config/code-assistant-manager/providers.json
 ```
+
+<!-- cam-prompt-id: 13daf2d6 -->