Add admin client endpoints

src/main/java/com/litoralregas/backend_gateway/client/ClientController.java

@@ -0,0 +1,28 @@
+package com.litoralregas.backend_gateway.client;
+
+import com.litoralregas.backend_gateway.client.dto.ClientResponse;
+import com.litoralregas.backend_gateway.client.dto.CreateClientRequest;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/admin/clients")
+public class ClientController {
+
+    private final ClientService clientService;
+
+    public ClientController(ClientService clientService) {
+        this.clientService = clientService;
+    }
+
+    @PostMapping
+    public ClientResponse create(@RequestBody CreateClientRequest request) {
+        return clientService.create(request);
+    }
+
+    @GetMapping
+    public List<ClientResponse> findAll() {
+        return clientService.findAll();
+    }
+}

src/main/java/com/litoralregas/backend_gateway/client/ClientService.java

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+package com.litoralregas.backend_gateway.client;
+
+import com.litoralregas.backend_gateway.client.dto.ClientResponse;
+import com.litoralregas.backend_gateway.client.dto.CreateClientRequest;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public class ClientService {
+
+    private final ClientRepository clientRepository;
+
+    public ClientService(ClientRepository clientRepository) {
+        this.clientRepository = clientRepository;
+    }
+
+    public ClientResponse create(CreateClientRequest request) {
+        ClientEntity client = new ClientEntity();
+        client.setName(request.name());
+        client.setBackendBaseUrl(request.backendBaseUrl());
+        client.setEnabled(true);
+
+        ClientEntity saved = clientRepository.save(client);
+
+        return toResponse(saved);
+    }
+
+    public List<ClientResponse> findAll() {
+        return clientRepository.findAll()
+                .stream()
+                .map(this::toResponse)
+                .toList();
+    }
+
+    private ClientResponse toResponse(ClientEntity client) {
+        return new ClientResponse(
+                client.getId(),
+                client.getName(),
+                client.getBackendBaseUrl(),
+                client.isEnabled(),
+                client.getCreatedAt()
+        );
+    }
+}

src/main/java/com/litoralregas/backend_gateway/client/dto/ClientResponse.java

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+package com.litoralregas.backend_gateway.client.dto;
+
+public record ClientResponse(
+        Long id,
+        String name,
+        String backendBaseUrl,
+        boolean enabled,
+        String createdAt
+) {
+}

src/main/java/com/litoralregas/backend_gateway/client/dto/CreateClientRequest.java

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+package com.litoralregas.backend_gateway.client.dto;
+
+public record CreateClientRequest(
+        String name,
+        String backendBaseUrl
+) {
+}