Add Docker with MariaDB support

- Dockerfile now includes MariaDB server
- Add docker-entrypoint.sh to initialize DB, create user, and set permissions
- docker-compose.yml with configurable environment variables
- Nginx config proxies API to backend

server/db-mariadb.js

@@ -1,5 +1,6 @@
 import * as mariadb from 'mariadb';
-import * as bcrypt from 'bcryptjs';
+import bcrypt from 'bcryptjs';
+const { compareSync, hashSync } = bcrypt;
 
 // UUID generator
 export function generateUUID() {
@@ -279,11 +280,11 @@ export async function deleteUsuario(id) {
 export async function verifyPassword(dni, password) {
   const row = await queryOne('SELECT passwordHash FROM usuarios WHERE dni = ?', [dni]);
   if (!row) return false;
-  return bcrypt.compareSync(password, row.passwordHash);
+  return compareSync(password, row.passwordHash);
 }
 
 export function hashPassword(password) {
-  return bcrypt.hashSync(password, 10);
+  return hashSync(password, 10);
 }
 
 // ========== PACIENTES ==========