feat: Add Pipelines and Users management pages
Frontend Phase 2 - Additional Management Pages:
- Implement Pipelines management with Start/Stop/Restart controls
- Implement Users management with role assignment and enable/disable
- Add routing for Pipelines and Users pages
Pipelines Page Features:
- DataGrid table with pipeline list
- Type filter (RSS Collector, Translator, Image Generator)
- Status filter (Running, Stopped, Error)
- Pipeline controls (Start, Stop, Restart)
- Add/Edit pipeline dialog with JSON config editor
- Delete confirmation dialog
- Success rate display
- Cron schedule management
Users Page Features:
- DataGrid table with user list
- Role filter (Admin, Editor, Viewer)
- Status filter (Active, Disabled)
- Enable/Disable user toggle
- Add/Edit user dialog with role selection
- Delete confirmation dialog
- Password management for new users
Progress:
✅ Keywords Management
✅ Pipelines Management
✅ Users Management
⏳ Applications Management (pending)
⏳ Articles List (pending)
⏳ Monitoring Page (pending)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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