feat: Agregar modulo de Sistema (mongosh, logs, export/import)

server/db-mongodb.js

@@ -993,3 +993,68 @@ export async function setValue(key, value) {
     memStore.kv[key] = value;
   }
 }
+
+export function getDb() {
+  return db;
+}
+
+export async function exportAllData() {
+  const collections = [
+    'usuarios', 'pacientes', 'areas', 'camas', 'internaciones',
+    'evoluciones', 'laboratorios', 'glucemias', 'acidosbase',
+    'cultivos', 'estudiosComplementarios', 'interconsultas', 'atb',
+    'indicaciones', 'movimientos_indicaciones', 'pendientes', 'kv'
+  ];
+  const dump = {};
+  if (db) {
+    for (const name of collections) {
+      const docs = await db.collection(name).find().toArray();
+      dump[name] = docs;
+    }
+  } else {
+    for (const name of collections) {
+      dump[name] = [...(memStore[name] || [])];
+    }
+  }
+  return dump;
+}
+
+export async function importAllData(dump) {
+  const collections = [
+    'usuarios', 'pacientes', 'areas', 'camas', 'internaciones',
+    'evoluciones', 'laboratorios', 'glucemias', 'acidosbase',
+    'cultivos', 'estudiosComplementarios', 'interconsultas', 'atb',
+    'indicaciones', 'movimientos_indicaciones', 'pendientes', 'kv'
+  ];
+  if (db) {
+    for (const name of collections) {
+      if (Array.isArray(dump[name])) {
+        try {
+          await db.collection(name).deleteMany({});
+        } catch (e) {
+          console.warn(`Could not clear collection ${name}:`, e);
+        }
+        if (dump[name].length > 0) {
+          const cleaned = dump[name].map(doc => {
+            const copy = { ...doc };
+            if (copy._id) {
+              if (ObjectId.isValid(copy._id)) {
+                copy._id = new ObjectId(copy._id);
+              } else {
+                delete copy._id;
+              }
+            }
+            return copy;
+          });
+          await db.collection(name).insertMany(cleaned);
+        }
+      }
+    }
+  } else {
+    for (const name of collections) {
+      if (Array.isArray(dump[name])) {
+        memStore[name] = [...dump[name]];
+      }
+    }
+  }
+}