refactor: Standardize CLI tools with clap and enhance security
* Add clap dependency as optional feature for all CLI tools
* Convert all 12 CLI binaries to use clap derive patterns for consistent argument parsing
* Implement secure password prompts with rpassword and secrecy crates
* Add comprehensive help documentation and environment variable support
* Update CLAUDE.md with detailed CLI usage examples and patterns
* Feature-gate all binaries behind 'clap' feature to maintain library-first design
* Enhance Dockerfile build process to include clap feature