feat: Implement CRUD API endpoints for core modules

Adds Express.js routes and Prisma-based handlers for common database operations (Create, Read, Update, Delete) for the following modules:

- Empleados (subset of Cliente model)
- Asistencias
- Tareas (TareaRealizada model)
- Planillas

Each module's routes are separated into their own files within `api/routes/`. The new routes are registered in `api/server.js`.

Basic error handling, including try-catch blocks and checks for common Prisma errors (e.g., P2025 for record not found, P2003 for foreign key violations), has been implemented in each endpoint.

api/server.js

@@ -1,6 +1,13 @@
 import express from 'express';
 import { PrismaClient } from './prisma/generated/client/index.js';
 import { Decimal } from '@prisma/client/runtime/library.js';
+
+// Import new routers
+import empleadosRouter from './routes/empleados/empleados.js';
+import asistenciasRouter from './routes/asistencias/asistencias.js';
+import tareasRouter from './routes/tareas/tareas.js';
+import planillasRouter from './routes/planillas/planillas.js';
+
 BigInt.prototype.toJSON = function () { return this.toString(); };
 Decimal.prototype.toJSON = function () { return this.toString(); };
 
@@ -8,6 +15,12 @@ const prisma = new PrismaClient();
 export const app = express();
 app.use(express.json());
 
+// Mount new routers
+app.use('/api/empleados', empleadosRouter);
+app.use('/api/asistencias', asistenciasRouter);
+app.use('/api/tareas', tareasRouter);
+app.use('/api/planillas', planillasRouter);
+
 app.get('/api/test', (req, res) => res.json({ message: 'Hello World' }));
 
 app.post('/api/clientes/random', async (_req, res) => {