added frontend user management

frontend/src/types/employee.ts

@@ -0,0 +1,38 @@
+// frontend/src/types/employee.ts
+export interface Employee {
+  id: string;
+  email: string;
+  name: string;
+  role: 'admin' | 'instandhalter' | 'user';
+  isActive: boolean;
+  createdAt: string;
+  lastLogin?: string;
+  phone?: string;
+  department?: string;
+}
+
+export interface Availability {
+  id: string;
+  employeeId: string;
+  dayOfWeek: number; // 0-6 (Sonntag-Samstag)
+  startTime: string; // "08:00"
+  endTime: string;   // "16:00"
+  isAvailable: boolean;
+}
+
+export interface CreateEmployeeRequest {
+  email: string;
+  password: string;
+  name: string;
+  role: 'admin' | 'instandhalter' | 'user';
+  phone?: string;
+  department?: string;
+}
+
+export interface UpdateEmployeeRequest {
+  name?: string;
+  role?: 'admin' | 'instandhalter' | 'user';
+  isActive?: boolean;
+  phone?: string;
+  department?: string;
+}