feat(blockchain): wire BlockchainModule into dependent modules

[khaadish]

Closes #307

Changes

• Add backend/src/config/stellar.config.ts registering STELLAR_SECRET_KEY, STELLAR_CONTRACT_ID, STELLAR_RPC_URL (default Soroban testnet RPC) and STELLAR_NETWORK_PASSPHRASE (default Test SDF passphrase) under the 'stellar' namespace.
• Register that config in BlockchainModule via ConfigModule.forFeature(stellarConfig) and document where the four on-chain providers from issues 11-14 must be registered as they land. BlockchainService remains the single export.
• Import BlockchainModule into ProgressModule, UsersModule and QuestsModule so BlockchainService is injectable for submitPuzzleOnChain, registerPlayerOnChain/syncXpMilestone flows.
• Document STELLAR_* variables in backend/.env.example.
• Add blockchain.module.spec.ts guarding that BlockchainModule provides/exports BlockchainService, is imported by all three consumer modules, and that consumers do not list BlockchainService in their own providers.

Verification

• tsc --noEmit: clean
• npm run build: clean
• jest blockchain specs: 12 passed (incl. 5 new wiring tests)
• eslint on changed files: clean
• no absolute src/ imports

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
mind-block-app-frontend	Skipped		Aug 23, 2026 5:26am