feat: canonical idempotency key for Soroban events#612
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Adds canonical Soroban event idempotency by deriving and persisting a stable event_key from txHash:ledger:eventIndex.
Extends processed_events with event_key text unique not null
Backfills existing events where possible
Parses canonical event keys in eventParser.ts
Uses the canonical key in eventProcessor.ts for duplicate detection
Adds tests in eventProcessor.idempotency.test.ts
Documents the new idempotency contract in event-processing.md
This makes retry handling deterministic and prevents duplicate processed-event inserts for the same Soroban event.
closes #471