Add router CRUD API

src/main/java/com/litoralregas/vpnprovisioner/router/controller/RouterController.java

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+package com.litoralregas.vpnprovisioner.router.controller;
+
+import com.litoralregas.vpnprovisioner.router.dto.CreateRouterRequest;
+import com.litoralregas.vpnprovisioner.router.dto.RouterResponse;
+import com.litoralregas.vpnprovisioner.router.dto.UpdateRouterRequest;
+import com.litoralregas.vpnprovisioner.router.service.RouterService;
+import jakarta.validation.Valid;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+import java.util.UUID;
+
+@RestController
+@RequestMapping("/api/routers")
+public class RouterController {
+
+    private final RouterService routerService;
+
+    public RouterController(RouterService routerService) {
+        this.routerService = routerService;
+    }
+
+    @PostMapping
+    @ResponseStatus(HttpStatus.CREATED)
+    public RouterResponse create(@Valid @RequestBody CreateRouterRequest request) {
+        return routerService.create(request);
+    }
+
+    @GetMapping
+    public List<RouterResponse> findAll() {
+        return routerService.findAll();
+    }
+
+    @GetMapping("/{id}")
+    public RouterResponse findById(@PathVariable UUID id) {
+        return routerService.findById(id);
+    }
+
+    @PutMapping("/{id}")
+    public RouterResponse update(
+            @PathVariable UUID id,
+            @Valid @RequestBody UpdateRouterRequest request
+    ) {
+        return routerService.update(id, request);
+    }
+
+    @DeleteMapping("/{id}")
+    @ResponseStatus(HttpStatus.NO_CONTENT)
+    public void delete(@PathVariable UUID id) {
+        routerService.delete(id);
+    }
+}

src/main/java/com/litoralregas/vpnprovisioner/router/dto/CreateRouterRequest.java

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+package com.litoralregas.vpnprovisioner.router.dto;
+
+import jakarta.validation.constraints.NotBlank;
+
+public record CreateRouterRequest(
+        @NotBlank String name,
+        String hardwareModel,
+        String firmwareVersion
+) {
+}

src/main/java/com/litoralregas/vpnprovisioner/router/dto/RouterResponse.java

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+package com.litoralregas.vpnprovisioner.router.dto;
+
+import com.litoralregas.vpnprovisioner.router.entity.RouterStatus;
+
+import java.time.Instant;
+import java.util.UUID;
+
+public record RouterResponse(
+        UUID id,
+        String name,
+        String hardwareModel,
+        String firmwareVersion,
+        RouterStatus status,
+        String vpnIp,
+        Instant createdAt,
+        Instant updatedAt
+) {
+}

src/main/java/com/litoralregas/vpnprovisioner/router/dto/UpdateRouterRequest.java

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+package com.litoralregas.vpnprovisioner.router.dto;
+
+import jakarta.validation.constraints.NotBlank;
+
+public record UpdateRouterRequest(
+        @NotBlank String name,
+        String hardwareModel,
+        String firmwareVersion
+) {
+}

src/main/java/com/litoralregas/vpnprovisioner/router/entity/Router.java

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+package com.litoralregas.vpnprovisioner.router.entity;
+
+import jakarta.persistence.*;
+
+import java.time.Instant;
+import java.util.UUID;
+
+@Entity
+@Table(name = "routers")
+public class Router {
+
+    @Id
+    private UUID id;
+
+    @Column(nullable = false)
+    private String name;
+
+    private String hardwareModel;
+
+    private String firmwareVersion;
+
+    @Enumerated(EnumType.STRING)
+    @Column(nullable = false)
+    private RouterStatus status;
+
+    private String vpnIp;
+
+    @Column(nullable = false)
+    private Instant createdAt;
+
+    @Column(nullable = false)
+    private Instant updatedAt;
+
+    protected Router() {
+    }
+
+    public Router(String name, String hardwareModel, String firmwareVersion) {
+        this.id = UUID.randomUUID();
+        this.name = name;
+        this.hardwareModel = hardwareModel;
+        this.firmwareVersion = firmwareVersion;
+        this.status = RouterStatus.PENDING;
+        this.createdAt = Instant.now();
+        this.updatedAt = Instant.now();
+    }
+
+    @PreUpdate
+    public void preUpdate() {
+        this.updatedAt = Instant.now();
+    }
+
+    public UUID getId() { return id; }
+    public String getName() { return name; }
+    public String getHardwareModel() { return hardwareModel; }
+    public String getFirmwareVersion() { return firmwareVersion; }
+    public RouterStatus getStatus() { return status; }
+    public String getVpnIp() { return vpnIp; }
+    public Instant getCreatedAt() { return createdAt; }
+    public Instant getUpdatedAt() { return updatedAt; }
+
+    public void updateDetails(String name, String hardwareModel, String firmwareVersion) {
+        this.name = name;
+        this.hardwareModel = hardwareModel;
+        this.firmwareVersion = firmwareVersion;
+    }
+}

src/main/java/com/litoralregas/vpnprovisioner/router/entity/RouterStatus.java

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+package com.litoralregas.vpnprovisioner.router.entity;
+
+public enum RouterStatus {
+    PENDING,
+    CONFIGURED,
+    PROVISIONING,
+    PROVISIONED,
+    FAILED,
+    REMOVED
+}

src/main/java/com/litoralregas/vpnprovisioner/router/repository/RouterRepository.java

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+package com.litoralregas.vpnprovisioner.router.repository;
+
+import com.litoralregas.vpnprovisioner.router.entity.Router;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.UUID;
+
+public interface RouterRepository extends JpaRepository<Router, UUID> {
+}

src/main/java/com/litoralregas/vpnprovisioner/router/service/RouterService.java

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+package com.litoralregas.vpnprovisioner.router.service;
+
+import com.litoralregas.vpnprovisioner.router.dto.CreateRouterRequest;
+import com.litoralregas.vpnprovisioner.router.dto.RouterResponse;
+import com.litoralregas.vpnprovisioner.router.dto.UpdateRouterRequest;
+import com.litoralregas.vpnprovisioner.router.entity.Router;
+import com.litoralregas.vpnprovisioner.router.repository.RouterRepository;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+import java.util.UUID;
+
+@Service
+public class RouterService {
+
+    private final RouterRepository routerRepository;
+
+    public RouterService(RouterRepository routerRepository) {
+        this.routerRepository = routerRepository;
+    }
+
+    @Transactional
+    public RouterResponse create(CreateRouterRequest request) {
+        Router router = new Router(
+                request.name(),
+                request.hardwareModel(),
+                request.firmwareVersion()
+        );
+
+        Router saved = routerRepository.save(router);
+        return toResponse(saved);
+    }
+
+    @Transactional(readOnly = true)
+    public List<RouterResponse> findAll() {
+        return routerRepository.findAll()
+                .stream()
+                .map(this::toResponse)
+                .toList();
+    }
+
+    @Transactional(readOnly = true)
+    public RouterResponse findById(UUID id) {
+        Router router = routerRepository.findById(id)
+                .orElseThrow(() -> new IllegalArgumentException("Router not found: " + id));
+
+        return toResponse(router);
+    }
+
+    @Transactional
+    public RouterResponse update(UUID id, UpdateRouterRequest request) {
+        Router router = routerRepository.findById(id)
+                .orElseThrow(() -> new IllegalArgumentException("Router not found: " + id));
+
+        router.updateDetails(
+                request.name(),
+                request.hardwareModel(),
+                request.firmwareVersion()
+        );
+
+        return toResponse(router);
+    }
+
+    @Transactional
+    public void delete(UUID id) {
+        Router router = routerRepository.findById(id)
+                .orElseThrow(() -> new IllegalArgumentException("Router not found: " + id));
+
+        routerRepository.delete(router);
+    }
+
+    private RouterResponse toResponse(Router router) {
+        return new RouterResponse(
+                router.getId(),
+                router.getName(),
+                router.getHardwareModel(),
+                router.getFirmwareVersion(),
+                router.getStatus(),
+                router.getVpnIp(),
+                router.getCreatedAt(),
+                router.getUpdatedAt()
+        );
+    }
+}