🐛 [PM] missing `add` subcommand alias

[yuzheng14]

What happened?

Expected result

[Totoro-jam]

Hi @elrrrrrrr, I'm interested in working on this issue and will submit a comprehensive PR to add the add alias for the install command. 我不确定是否完备，如果没有缺失，我将按照计划执行，cc

Full Analysis & Implementation Plan

Issue Scope (Cross-Package Manager Compatibility)

This issue aims to make utoo-pm compatible with pnpm/npm users by supporting the add alias:

• ✅ npm install pkg / npm i pkg → now supports pnpm add pkg / utoo add pkg
• ✅ All install variants: utoo add, ut add, utoo add <specs>, etc.

Complete Implementation Checklist

1. Code Changes (3 files)

• constants.rs: Add INSTALL_ALIASES constant for display
• main.rs:
  • Import INSTALL_ALIASES constant
  • Add aliases = ["add"] to Install command definition
• service/config.rs: Update help text to display both aliases

2. Comprehensive Parameter Testing

All these combinations must work identically with both install and add:

• Basic: utoo add react, ut add react
• With versions: utoo add react@18 lodash@4
• With save flags: utoo add react -D (dev), utoo add react -O (optional)
• With peer flag: utoo add peerDep --save-peer
• With global: utoo add pkg -g, utoo add pkg --global --prefix /usr/local
• With workspace: utoo add pkg -w packages/ui, utoo add pkg --workspace packages/*
• With production flag: utoo add pkg --production
• With omit flags: utoo add pkg --omit dev,optional
• With migration: utoo add pkg --from pnpm
• With scripts: utoo add pkg --ignore-scripts

3. Unit Tests (in main.rs)

• test_add_alias_recognized: Verify clap parses "add" as valid command
• test_add_with_all_parameters: Verify all flags work with add alias
• test_help_includes_add_alias: Verify help text shows "add" in aliases

4. E2E Tests (shell scripts)

• Add test case in e2e/utoo-pm.sh for add alias functionality
• Test with various parameter combinations
• Verify help text: utoo --help and utoo add --help
• Test shell completions: bash, zsh, fish

5. Edge Case Verification

• Backward compatibility: utoo install still works identically
• No parameter conflicts between install/add
• Shell completion includes "add" in suggestions
• Config help output shows: install (i, add)

6. Documentation Updates

• README shows ut add lodash as an option
• Help text mentions both install and add

Implementation Notes

• The underlying PackageAction::Add enum already exists and handles the add semantics
• No business logic changes needed, only CLI alias configuration
• All parameters pass through the same update_packages() function regardless of command name
• This is purely a command-line interface enhancement for user familiarity

Testing Output Verification

$ utoo --help
install         Install project dependencies (i, add)  ← Shows both aliases

$ utoo add react -D
✓ Successfully installed with dev flag

$ ut add lodash --global
✓ Successfully installed globally

$ utoo add --help
Usage: utoo add [OPTIONS] [SPECS]...