Create Fetch Squads MVP prototype

[Fredess74]

Summary

• document project setup, environment variables, and launch commands for the Fetch Squads MVP
• implement the React frontend with authentication, squad management flows, and dashboard components backed by Firestore
• add a Cloud Function for sharing receipt points and a Node.js seed script to populate demo data

Testing

• not run (not applicable)

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https://chatgpt.com/codex/tasks/task_e_68d621c2ba208321bbb86434d0296f14