fix: include python-multipart in backend setup

[Portella25]

Summary

• add python-multipart to backend requirements so FastAPI starts cleanly with upload routes enabled
• update frontend Vite proxy default target from 127.0.0.1:8001 to 127.0.0.1:8000 to match documented backend port and avoid dashboard fetch errors in local dev
• validate full dev environment by installing dependencies and running backend + frontend + watcher

Walkthrough Artifacts

fc_companion_env_working_demo.mp4

Frontend dashboard loaded
Backend Swagger docs

Validation

• backend deps install: python3 -m pip install -r requirements.txt
• frontend deps install: npm install
• save parser deps install: npm install (in backend/save_reader/node_fbparser)
• backend run: python3 -m uvicorn main:app --host 127.0.0.1 --port 8000
• frontend run: npm run dev -- --host 127.0.0.1 --port 5173
• watcher run: python3 watcher.py
• API health: curl http://127.0.0.1:8000/health
• API events: curl http://127.0.0.1:8000/events/recent
• frontend proxy path check: curl "http://127.0.0.1:5173/dashboard/home?save_uid=default_save&news_limit=5&timeline_limit=6&alerts_limit=6"

Notes

• watcher.py is running and waiting for state_lua.json / save_data.json, which is expected in this cloud Linux environment without the game/live editor feed.
• existing npm audit warnings are from third-party dependency tree and were not altered in this setup task.

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