feat(examples): add supervision-service web app with FastAPI and Vue

[cxiaopao]

Summary

• Add a full-stack supervision example with FastAPI backend and Vue 3 frontend
• Support video tracking, speed estimation, async jobs, and SQLite history
• Include development and production deployment instructions in README

Test plan

• Start API: \astapi dev app/main.py\ in examples/supervision-service
• Start webapp:
  pm run dev\ in examples/supervision-service/webapp
• Upload a video and run track + speed estimation workflows
• Verify history records persist after page refresh
• Build production bundle:
  pm run build\ and serve via FastAPI static files

Made with Cursor

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❌ cxiaopao
❌ DavidWangW
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