I'll use a .gitignored copy of `master` for Windsurf's ref

- Add proper request/response type interfaces
- Update tsconfig.json with better module resolution
- Clean up adapter imports and type usage
- Remove redundant CDNSettings imports
- Improve CloudflareAdapter type safety

Keep Decision interface in OptimizelyProvider as it's a core Optimizely concept

…pt versions

- Removed duplicate JavaScript files that have TypeScript equivalents:
  - coreLogic.js -> CoreLogic.ts
  - optimizelyProvider.js -> OptimizelyProvider.ts
  - userProfileService.js -> UserProfileService.ts
  - eventListeners.js -> EventListeners.ts
  - registeredListeners.js -> RegisteredListeners.ts

- Updated imports in affected files to use TypeScript versions:
  - CoreLogic.ts
  - CloudflareAdapter.ts
  - index.js

- Created new TypeScript API types in src/types/api.ts
- Migrated API handlers to TypeScript:
  - apiRouter.js -> ApiRouter.ts
  - handlers/datafile.js -> handlers/Datafile.ts
  - handlers/flagKeys.js -> handlers/FlagKeys.ts
  - handlers/sdk.js -> handlers/Sdk.ts
  - handlers/variationChanges.js -> handlers/VariationChanges.ts
- Created handlers/index.ts to export all handlers
- Updated index.js to use new TypeScript API router
- Removed old JavaScript API files

- Removed 'I' prefix from type names following TypeScript best practices
- Converted interfaces to type aliases where appropriate
- Updated type exports to use explicit named exports
- Updated type documentation to reflect changes
- Maintained consistent type naming across the codebase

- Remove unused optlyHelper dependency
- Replace helper functions with native JSON methods
- Add proper error handling for JSON parsing
- Fix parameter reassignment with proper variable scoping
- Use TypeScript idiomatic type checking

- Convert regular imports to type imports where appropriate
- Rename extractCdnSettings to extractDecisionSettings
- Update DefaultSettings export to named export
- Fix trailingComma to trailingCommas in biome config