T3-044: Devnet testing — full flow with test SOL

Track: 3 — Solana Phone / Web3
Section: Infrastructure & Testing (20h)
Status: [ ] Todo
Repo: backend-api + app-user
Branch: feature/T3-044-devnet-full-test
Estimated Hours: 4h

Done When

Full test on devnet: connect wallet -> earn badge -> mint NFT -> view on explorer. Test SOL from faucet

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