chore: estructura inicial del MVP

Backend (Express + MariaDB) y frontend (React + Vite, identidad Fluent/Windows) con el
nucleo funcional: seguridad, organizacion, proyectos, actividades, subtareas, dependencias,
dashboard, calendario, gantt, comentarios, adjuntos, notificaciones in-app y catalogos.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

backend/src/modules/audit/controller.js

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+import { ok, asyncHandler } from '../../utils/http.js';
+import * as repo from './repository.js';
+
+export const getAudit = asyncHandler(async (req, res) => {
+  const { entityType, entityId } = req.query;
+  ok(res, await repo.findAll({ entityType, entityId: entityId ? Number(entityId) : undefined }));
+});

backend/src/modules/audit/repository.js

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+import { pool } from '../../config/db.js';
+
+export async function findAll({ entityType, entityId } = {}) {
+  const clauses = [];
+  const params = [];
+  if (entityType) { clauses.push('a.entity_type = ?'); params.push(entityType); }
+  if (entityId) { clauses.push('a.entity_id = ?'); params.push(entityId); }
+  const where = clauses.length ? `WHERE ${clauses.join(' AND ')}` : '';
+  const [rows] = await pool.query(
+    `SELECT a.id, a.user_id, u.name AS user_name, a.action, a.entity_type, a.entity_id, a.detail_json, a.created_at
+     FROM audit_log a LEFT JOIN users u ON u.id = a.user_id
+     ${where} ORDER BY a.created_at DESC LIMIT 200`,
+    params
+  );
+  return rows;
+}

backend/src/modules/audit/routes.js

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+import { Router } from 'express';
+import { requireAuth, requireRole, ROLES } from '../../middleware/auth.js';
+import { getAudit } from './controller.js';
+
+const router = Router();
+
+router.use(requireAuth, requireRole(ROLES.ADMIN, ROLES.IT_MANAGER));
+router.get('/', getAudit);
+
+export default router;