Refactor: Centralize Prisma schema and restrict DB access

This commit refactors the project to use a shared Prisma schema and restricts direct database access to the API service.

Key changes:

- Created a new shared package `core/prisma` containing the Prisma schema, generated client, and types.
- Configured the monorepo to use NPM workspaces, including `core/prisma` and all services.
- Updated all services (`api`, `ui`, `mcp`, `agent`, and the background processing service) to depend on `@empresa/prisma-schema`.
- The API service now imports `PrismaClient` from `@empresa/prisma-schema/client`.
- Other services import only types from `@empresa/prisma-schema`.
- Removed redundant Prisma configurations from `api` and the background processing service.
- Updated the background processing service's `sync-empleados.js` to fetch data via an API call instead of direct database access.
- Updated TypeScript configurations (`tsconfig.base.json` and service-specific ones) to support the new structure and path aliases.
- Updated `README.md` to reflect the new architecture and added convenience scripts for Prisma operations.

This change promotes a single source of truth for data models, reduces code duplication, and improves the overall architecture by centralizing database operations within the API service.

ui/src/components/empleados/cardEmpleado.vue

@@ -43,20 +43,7 @@
 <script setup lang="ts">
 import { PropType } from 'vue'
 import { useRouter } from 'vue-router'
-
-// Define the structure of the employee object based on the Prisma schema
-interface Employee {
-  id: string | number // Changed from BigInt to string | number for easier handling in frontend
-  name: string
-  cedula: number // Changed from BigInt
-  avatar_url?: string
-  telefono?: string
-  ubicacion: string
-  idciat?: string
-  grupo_estudio?: string
-  // created_at and updated_at are usually not displayed directly in a summary card
-  // empleado: boolean // This is implicit as it's an employee card
-}
+import type { Employee } from '@empresa/prisma-schema'
 
 const props = defineProps({
   employee: {