feat(backend): implement JWT auth with Stellar wallet signature#45
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…tyOnChain#8) - Add AuthModule with GET /auth/challenge and POST /auth/verify - Verify Stellar keypair signatures using @stellar/stellar-sdk - Nonces stored in-memory with 5-minute TTL and replay protection - JWT signed with JWT_SECRET env var, 24h expiry - JwtAuthGuard applied to POST/PATCH/DELETE /bounties routes - 7 unit tests covering challenge generation and verify flow
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Summary
Implements JWT authentication via Stellar wallet signature as described in #8.
Changes
GET /auth/challenge?address=G...— returns a one-time hex nonce (stored in-memory, 5-min TTL)POST /auth/verify{ address, signature, nonce }— verifies the Stellar keypair signature using@stellar/stellar-sdk, issues a 24h JWT signed withJWT_SECRETJwtAuthGuardapplied toPOST,PATCH,DELETEon/bountiesTested
npm test— 7/7 passingnpm run build— no errorsCloses #8