feat: Phase 1 - Angular to React Service Layer Migration

[devin-ai-integration]

feat: Phase 1 - Angular to React Service Layer Migration

Summary

This PR implements Phase 1 of migrating the service layer from Angular to React-native patterns. Creates new React service implementations for AuthorService and CommentService that use the native fetch API instead of Angular's $http service, while maintaining identical API contracts and caching behavior.

Key changes:

• ✅ src/services/AuthorService/reactService.js - Replaces $http.get() with fetch(), preserves ID-based caching via reduce
• ✅ src/services/CommentService/reactService.js - Replaces $http.get() with fetch(), preserves array-based caching
• ✅ Maintains exact method signatures: queryComments(), getComments(), setComments() for CommentService and queryAuthors(), getAuthor(id), setAuthors() for AuthorService
• ✅ Preserves constructor behavior: AuthorService initializes this.authors = {}, CommentService leaves this.comments undefined until first set

Critical implementation detail: Angular's $http.get(URI) returns {data: response} while fetch(URI) returns a Response object requiring .json() to extract data. The new services handle this with fetch(URI).then(resp => resp.json()).then(data => ...).

Note: These are standalone React service files that are not yet integrated into the application. React components still use getAngularService() to access the Angular services. Integration will be a future phase.

Review & Testing Checklist for Human

Risk Level: 🟡 Medium - No automated tests exist for service behavioral equivalence

• Manual API testing: Start the mock API (npm run api) and manually test both new React services in browser console to verify they fetch and cache data correctly
• Caching behavior verification: Compare the reduce-based ID mapping in AuthorService line-by-line with the original Angular implementation to ensure identical behavior
• Constructor initialization check: Verify AuthorService initializes this.authors = {} while CommentService leaves this.comments undefined (matching Angular behavior)

Notes

These React services maintain identical API contracts but are completely separate from the existing Angular services. Future phases will integrate them into React components and eventually replace the Angular services entirely.

Link to Devin run: https://app.devin.ai/sessions/092892afdcd043f8b5bbe4509847c6f6
Requested by: @benc-a11y

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