test: add Redis integration tests with Testcontainers

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Docker-based tests with real Redis verifying:
- BITFIELD write → GETRANGE read round-trip for all 32 colors
- Pixel placement at canvas boundaries and various positions
- Pixel overwrite correctness
- 5-bit boundary isolation (adjacent pixels don't corrupt)
- Batch atomicity (100 pixels in single BITFIELD)
- Rate limiter Lua script: credit grant, deduction, regen, cap, rejection

Test commands: npm test (unit), npm run test:integration (Docker),
npm run test:all (both). 82 total tests.

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tiennm99 committed 2026-04-16 22:52:36 +07:00

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