feat: initial implementation of EnvGuard with improved TUI layout

internal/models/models.go

@@ -0,0 +1,23 @@
+package models
+
+import "time"
+
+// Service represents a microservice that can be locked.
+type Service struct {
+	Name      string    `json:"name"`
+	IsLocked  bool      `json:"is_locked"`
+	LockedBy  string    `json:"locked_by,omitempty"`
+	LockedAt  time.Time `json:"locked_at,omitempty"`
+}
+
+// LockRequest is the payload to lock a service.
+type LockRequest struct {
+	ServiceName string `json:"service_name"`
+	User        string `json:"user"`
+}
+
+// UnlockRequest is the payload to unlock a service.
+type UnlockRequest struct {
+	ServiceName string `json:"service_name"`
+	User        string `json:"user"`
+}