feat: Add UserController and user-related DTOs for user management functionality

Api/User.http

@@ -0,0 +1,70 @@
+### User Controller API Tests
+
+@baseUrl = http://localhost:5000
+@authToken = YOUR_JWT_TOKEN_HERE
+
+### Get all users with pagination
+GET {{baseUrl}}/api/user?page=1&pageSize=10
+Authorization: Bearer {{authToken}}
+
+### Get all users with search
+GET {{baseUrl}}/api/user?search=john&isActive=true
+Authorization: Bearer {{authToken}}
+
+### Get specific user by ID
+GET {{baseUrl}}/api/user/1
+Authorization: Bearer {{authToken}}
+
+### Get current user profile
+GET {{baseUrl}}/api/user/me
+Authorization: Bearer {{authToken}}
+
+### Create a new user
+POST {{baseUrl}}/api/user
+Authorization: Bearer {{authToken}}
+Content-Type: application/json
+
+{
+  "email": "newuser@example.com",
+  "firstName": "John",
+  "lastName": "Doe",
+  "profilePictureUrl": "https://example.com/profile.jpg",
+  "isActive": true
+}
+
+### Update a user
+PUT {{baseUrl}}/api/user/1
+Authorization: Bearer {{authToken}}
+Content-Type: application/json
+
+{
+  "firstName": "Updated John",
+  "lastName": "Updated Doe",
+  "isActive": true
+}
+
+### Update current user profile
+PUT {{baseUrl}}/api/user/me
+Authorization: Bearer {{authToken}}
+Content-Type: application/json
+
+{
+  "firstName": "My Updated Name",
+  "profilePictureUrl": "https://example.com/new-profile.jpg"
+}
+
+### Soft delete user (deactivate)
+DELETE {{baseUrl}}/api/user/1
+Authorization: Bearer {{authToken}}
+
+### Reactivate a soft-deleted user
+POST {{baseUrl}}/api/user/1/reactivate
+Authorization: Bearer {{authToken}}
+
+### Permanently delete user
+DELETE {{baseUrl}}/api/user/1/permanent
+Authorization: Bearer {{authToken}}
+
+### Get user statistics
+GET {{baseUrl}}/api/user/statistics
+Authorization: Bearer {{authToken}}