chore: refactor project structure and clean up unused components

- Updated `TODO.md` to reflect new testing tasks and final structure expectations.
- Simplified TypeScript path mappings in `tsconfig.json` for better clarity.
- Revised business logic separation rules in `.cursor/rules` to align with new directory structure.
- Deleted unused client components and services to streamline the codebase.
- Adjusted import paths in scripts to match the new structure.

.cursor/rules/project-structure.mdc

@@ -5,26 +5,26 @@ alwaysApply: true
 # Project Structure Rules
 
 1. Backend:
-   - [services/](mdc:services/) - ALL database access
-   - [app/api/](mdc:app/api/) - API routes using services
+   - [src/services/](mdc:src/services/) - ALL database access
+   - [src/app/api/](mdc:src/app/api/) - API routes using services
 
 2. Frontend:
-   - [clients/](mdc:clients/) - HTTP clients
-   - [components/](mdc:components/) - React components (organized by domain)
-   - [hooks/](mdc:hooks/) - React hooks
+   - [src/clients/](mdc:src/clients/) - HTTP clients
+   - [src/components/](mdc:src/components/) - React components (organized by domain)
+   - [src/hooks/](mdc:src/hooks/) - React hooks
 
 3. Shared:
-   - [lib/](mdc:lib/) - Types and utilities
+   - [src/lib/](mdc:src/lib/) - Types and utilities
    - [scripts/](mdc:scripts/) - Utility scripts
 
 Key Files:
 
-- [services/database.ts](mdc:services/database.ts) - Database pool
-- [clients/base/http-client.ts](mdc:clients/base/http-client.ts) - Base HTTP client
-- [lib/types.ts](mdc:lib/types.ts) - Shared types
+- [src/services/database.ts](mdc:src/services/database.ts) - Database pool
+- [src/clients/base/http-client.ts](mdc:src/clients/base/http-client.ts) - Base HTTP client
+- [src/lib/types.ts](mdc:src/lib/types.ts) - Shared types
 
 ❌ FORBIDDEN:
 
-- Database access outside services/
-- HTTP calls outside clients/
-- Business logic in components/
+- Database access outside src/services/
+- HTTP calls outside src/clients/
+- Business logic in src/components/