feat(frontend): Implement Creator Directory UI and API integration

[Ikechukwu-Patrick]

Closes #388
Closes #389

Summary
This PR delivers the complete Creator Directory feature by combining the frontend UI implementation and the backend API integration into a single seamless view.

Changes Proposed

• UI/UX ([Frontend] [Feature] Implement Creator Directory UI (Search View) #388): Implemented a responsive grid of creator cards using Tailwind CSS. Cards display creator avatars, verification badges, basic biographies, and key statistics (verified documents, success rates). Included a dedicated search input.
• Service Layer ([Frontend] [Feature] Integrate Creator Directory API with Frontend Service Layer #389): Created frontend/services/creatorService.ts to cleanly decouple the /api/creators HTTP logic.
• State Management: Wired up frontend/app/creators/page.tsx to handle isLoading rendering, empty state fallbacks, and a graceful error state with a retry mechanism.
• Optimization: Added a lightweight 300ms debounce to the search input effect to prevent excessive API requests while typing.

Acceptance Criteria Checklist

• Directory renders correctly with Tailwind CSS.
• Data dynamically populates from the backend API.
• Loading states provide immediate visual feedback.
• Error states are handled gracefully without crashing the UI.

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