feat: add command aliases and cloud use context command

[JoshSalway]

Summary

• Command aliases (Feature: command aliases for frequently-used commands #77): Added $aliases property to five command classes so common commands have shortcuts: logs, vars, envs, apps, status
• cloud use command (Feature: cloud use command for optional context persistence #79): New command to set, display, or clear the current application/environment context stored in LocalConfig
• LocalConfig::remove(): Added method to support clearing context keys
• Tests: Added feature tests for alias registration and use command behavior (set, display, clear)

All 39 tests pass, PHPStan reports no errors.

Closes #77, closes #79

Aliases

Alias	Resolves to
logs	environment:logs
vars	environment:variables
envs	environment:list
apps	application:list
status	environment:get

cloud use usage

cloud use my-app production   # Set context
cloud use                     # Display current context
cloud use --clear             # Clear saved context

Test plan

• Verify aliases resolve to correct command classes
• Verify cloud use displays context when called without args
• Verify cloud use --clear removes context from LocalConfig
• PHPStan passes with no errors
• All 39 Pest tests pass

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