Fix bed management: preserve camaId from frontend to backend

- Use camaId generated in frontend instead of generating new one in backend API
- Remove patientId and internacionId from cama table (use internaciones table instead)
- Fix discharge: delete cama if fuera de area, mark available otherwise
- Fix MapaCamas to find patient via internaciones table

server/api-mariadb.js

@@ -239,7 +239,10 @@ app.put('/api/camas/:id', async (req, res) => {
 
 app.post('/api/camas', async (req, res) => {
   try {
-    const cama = { ...req.body, id: generateUUID() };
+    const cama = req.body;
+    if (!cama.id) {
+      cama.id = generateUUID();
+    }
     await createCama(cama);
     res.json(cama);
   } catch (err) {