feat: Enhance CLI commands with advanced features and shared-ai-utils integration

- analyze.py: Enhanced analysis command
  - Add JSON and table output formats
  - Integrate with shared-ai-utils MetricsCollector and InsightsEngine
  - Support --output flag to save analysis results
  - Add error recovery suggestions using shared-ai-utils
  - Fallback to basic analysis if shared-ai-utils not available
  - Display pattern frequency tables, recommendations, and summary stats

- config.py: Enhanced configuration management
  - Add --env-file option to update .env files directly
  - Improve configuration display with categorized table
  - Show source of each config value (env var vs default)
  - Validate FL_ prefix for environment variables
  - Better error handling with recovery suggestions

- review.py: Enhanced code review command
  - Integrate with shared-ai-utils pattern violation detection
  - Add --fix flag to show suggested fixes
  - Display violations in formatted table with severity indicators
  - Show error/warning counts and summaries
  - Fallback to basic checks if shared-ai-utils not available
  - Better error handling with file validation

- BEST_PRACTICES.md: Fix trailing newline

All commands now gracefully degrade if shared-ai-utils is not installed,
providing basic functionality while encouraging installation for advanced features.

Author: doronpers