T3-020: Set up Metaplex Bubblegum compressed NFT tree

Track: 3 — Solana Phone / Web3
Section: Phase C: NFT Achievement Badges (72h)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T3-020-bubblegum-merkle-tree
Estimated Hours: 6h

Done When

Create merkle tree on Solana devnet using Bubblegum. Tree can hold 1M+ compressed NFTs. Cost: ~$50 for tree creation

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