fix(#58,#68): pre-commit hooks docs + concurrent request tests

[devJaja]

Summary

Closes #58
Closes #68

---

Issue #58 — Pre-commit hooks (Husky + lint-staged)

• Root package.json has husky and lint-staged declared and wired up
• .husky/pre-commit runs npx lint-staged on every commit
• lint-staged runs ESLint + Prettier format check + TypeScript on staged api/src/**/*.ts and oracle/src/**/*.ts; cargo check on staged contract/**/*.rs
• Added Section 4 (Pre-commit Hooks) to CONTRIBUTING.md documenting what runs, setup (npm install), and bypass (git commit --no-verify)

Issue #68 — Concurrent request handling tests

Added Concurrent Request Handling describe block to integration.test.ts with 5 tests asserting real behavior — no catch-all status assertions:

Test	Assertion
Simultaneous deposits	buildUnsignedTransaction called exactly N times — no merging
Concurrent submits	submitTransaction + monitorTransaction each called exactly N times
Idempotency deduplication	5 concurrent requests with same key → submitTransaction called once
User isolation	Concurrent requests from different users use correct addresses
Partial failure isolation	One failure does not affect remaining successful requests

Also fixed pre-existing bugs blocking the test suite:

• jest.config.js: moduleNameMapping → moduleNameMapper (typo broke @/ path aliases)
• Added missing deps cls-hooked and uuid (required by requestId middleware)

Testing

cd api && npm test -- --testPathPattern=integration --no-coverage
# Tests: 44 passed, 44 total

Note: requestId.test.ts has 2 pre-existing failures on main unrelated to this PR.

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