feat(powershell): Noz PowerShell module with pipeline-native cmdlets
- Get-NozNote: list notes, filter by -Topic, -Status, -Lang
- Get-NozNoteContent: fetch markdown, accepts pipeline input by Slug
- Set-NozNote: update note content, accepts markdown from pipeline
- New-NozNote: create note with frontmatter template
- Remove-NozNote: delete note, ShouldProcess + ConfirmImpact.High for safety
- NozNote output object: clean PS-friendly properties (no internal Hash field)
- NozCmdletBase: shared config loading, API client lifecycle, error translation
- Noz.psd1: module manifest for PS 7.2+
- Install-NozModule.ps1: build + install to user module path
- NozCli.Core retargeted to net8.0 for PS 7.4 LTS compatibility
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