Add tags support to notes and team-notes commands

[Copilot]

The CLI had no way to set or view note tags, despite the HackMD API returning tags: string[] on every Note object.

Changes

• New flag – --tags <value> added to flags.ts as a comma-separated string (e.g. tag1,tag2)
• notes create / team-notes create – accept --tags, pass parsed array to API payload, surface a Tags column in the output table
• notes update / team-notes update – accept --tags, include parsed array in the PATCH payload
• notes / team-notes index listings – render a Tags column
• README – updated USAGE, FLAGS, and EXAMPLES for all six affected commands

Example

# Create a note with tags
hackmd-cli notes create --content='# Hello' --tags=cli,docs

# Update tags on an existing note
hackmd-cli notes update --noteId=WNkLM6gkS0Cg2cQ8rv7bYA --tags=tag1,tag2

# List notes now shows Tags column
hackmd-cli notes
# ID                     Title       Tags        User Path    Team Path
# ────────────────────── ─────────── ─────────── ──────────── ─────────
# raUuSTetT5uQbqQfLnz9lA Hello       cli, docs   userABC      null

Since tags is not part of the upstream CreateNoteOptions type or the updateNote payload's Pick, the extended payload is cast through an intersection type (& {tags?: string[]}) before being forwarded to the API client.

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