feat: add -projects flag to list Notehub projects

[gwolffblues]

Summary

• Adds a new -projects flag to the notehub CLI that lists all Notehub projects accessible to the authenticated user
• Each project includes its name, UID, and associated product UIDs
• Supports -pretty for formatted JSON output and -verbose for request/response debugging

Test plan

• Run notehub -projects and verify JSON output with project names, UIDs, and products
• Run notehub -projects -pretty and verify pretty-printed output
• Run notehub -projects -verbose and verify API requests are shown
• Run without authentication and verify appropriate error message

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