Fix weekly-newsletter workflow: use vm0-ai/run-action

[Lunarivibe]

Problem

The weekly-newsletter workflow was failing with error:

claude: command not found
Error: Process completed with exit code 127

Root Cause

The workflow format was incorrect. It tried to:

• Manually install Node.js and @vm0/cli
• Run claude setup-token command (which doesn't exist in @vm0/cli)
• Manually create .env files and run vm0 cook

Solution

Rewrote the workflow to follow the pattern established in daily-data-report.yaml:

• Use vm0-ai/run-action@v1 instead of manual CLI installation
• Pass secrets through the action's secrets parameter
• Simplified from 52 lines to 29 lines
• Follows the same pattern as other workflows in the repository

Changes

• ✅ Removed manual Node.js setup
• ✅ Removed manual CLI installation steps
• ✅ Removed invalid claude setup-token command
• ✅ Use vm0-ai/run-action@v1 with proper secrets handling
• ✅ Added workflow_dispatch inputs for manual triggering

Testing

After merge, the workflow should:

• Run successfully on schedule (every Friday at 9 AM UTC / 5 PM UTC+8)
• Be manually triggerable via GitHub Actions UI
• Generate weekly newsletter and sync to Notion