feat(backend): implement Soroban event indexer with cursor tracking - #155
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- Add Soroban RPC client for polling contract events from on-chain - Implement event decoder service to parse and structure contract events - Add indexer cursor service with database persistence for resumable indexing - Create indexer worker process for continuous event polling and ingestion - Add backfill CLI worker to reindex historical events from a specified ledger - Implement indexer health checks and error recovery with exponential backoff - Add database migration 005 to create indexer_cursor table with ledger tracking - Configure scval decoding utilities for Soroban contract data deserialization - Add comprehensive test suite with fixtures for event decoder, cursor, and migrations - Update package.json with indexer and backfill worker scripts - Add environment configuration for RPC URL, contract ID, polling intervals, and retry limits - Support cursor fallback and retention window management for RPC provider compatibility
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closes #126