Implement backend API foundation

- Created FastAPI application with CORS middleware
- Defined Pydantic models (RoleDetectionRequest, RolesResponse, TTSRequest, ErrorResponse)
- Implemented /api/health endpoint
- Set up error handling middleware for validation and general exceptions
- Configured logging with INFO level
- Added test script to verify API functionality
- Validates Requirements: 9.1, 9.2, 9.4

.kiro/specs/text-to-audiobook/tasks.md

@@ -1,6 +1,6 @@
 # Implementation Plan
 
-- [-] 1. Set up project structure and dependencies
+- [x] 1. Set up project structure and dependencies
   - Create backend directory with FastAPI project structure
   - Create frontend directory with React + TypeScript + Vite
   - Configure Python virtual environment and install dependencies (fastapi, uvicorn, kokoro, soundfile, python-multipart)
@@ -9,7 +9,7 @@
   - Set up environment variable configuration for both projects
   - _Requirements: 9.6, 10.2, 11.1_
 
-- [ ] 2. Implement backend API foundation
+- [x] 2. Implement backend API foundation
   - Create FastAPI application with CORS middleware
   - Define Pydantic models for requests and responses (RoleDetectionRequest, RolesResponse, TTSRequest, ErrorResponse)
   - Implement /api/health endpoint