feat: add details demo

control-plane/api/internal/demos/mem.go

@@ -65,6 +65,18 @@ func (m *MemStore) CountActive() (int, error) {
 	return n, nil
 }
 
+func (m *MemStore) GetDemoByUsername(username string) (Demo, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	for _, demo := range m.items {
+		if demo.Username == username {
+			return demo, nil
+		}
+	}
+	return Demo{}, ErrNotFound
+}
+
 // MemPool : Pool en mémoire (dev/tests), PoolSizePerService slots par service.
 type MemPool struct {
 	mu   sync.Mutex