Write integration tests for full stream lifecycle via API

[ogazboiz]

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Description

No integration tests verify the event indexer, stream controller, SSE broadcast, and RPC fallback working end-to-end.

Test Cases Needed

• Indexer processes stream_created → stream in GET /v1/streams/{id}
• Indexer processes stream_topped_up → depositedAmount updated
• Indexer processes stream_paused → isPaused = true, claimable stops growing
• Indexer processes stream_resumed → isPaused = false, accrual resumes
• Indexer processes stream_cancelled → isActive = false
• Stale DB (>30s) → GET /v1/streams/{id}/claimable falls back to RPC
• SSE client receives broadcast for each event

Files

• backend/src/__tests__/integration/streams.test.ts (create)

Acceptance Criteria

• All tests pass with real Postgres
• SSE verified with a test client
• Runs in CI

[Turawa2]

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[akintewe]

@akintewe has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

I've been creating intricate forms and e-commerce systems for more than four years as a full-stack developer. I have designed inventory management systems for agricultural enterprises and have experience with image processing and large-scale state management. I have also worked on this project in the past.
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This issue has been completed by @akintewe as part of the Stellar Wave Program's 4th Wave 🥳

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