Add comprehensive scripts for managing PIS project services:
- start-backend.ps1/.sh: Start Django backend with uvicorn/gunicorn
- start-frontend.ps1/.sh: Start Vue frontend dev server
- start-celery.ps1/.sh: Start Celery worker and beat
- stop-all.ps1/.sh: Stop all services gracefully
- stop-celery.ps1/.sh: Stop Celery services only
- view-logs.ps1/.sh: View and tail log files
- check-status.ps1/.sh: Check service status and ports
Cross-platform support:
- Windows PowerShell scripts with English output (UTF-8 safe)
- Unix/Linux/macOS Bash scripts with Chinese output
- WMI queries for PowerShell 5.1 compatibility
- Unified Makefile and make.ps1 orchestrators
Also add scripts-documentation.md with comprehensive usage guide.
Comprehensive plan for buyer/supplier dashboard with:
- Role-based unified API
- Backend serializers and views
- Frontend Pinia store and Vue components
- ECharts trend visualization
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