feat: add organization REST endpoints

src/main/java/com/slotline/organization/OrganizationController.java

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+package com.slotline.organization;
+
+import com.slotline.organization.dto.OrganizationRequest;
+import com.slotline.organization.dto.OrganizationResponse;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import jakarta.validation.Valid;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/api/organizations")
+@Tag(name = "Organizations")
+public class OrganizationController {
+
+    private final OrganizationService organizationService;
+
+    public OrganizationController(OrganizationService organizationService) {
+        this.organizationService = organizationService;
+    }
+
+    @GetMapping
+    @Operation(summary = "List tenants (ADMIN only)")
+    public List<OrganizationResponse> list() {
+        return organizationService.findAll();
+    }
+
+    @PostMapping
+    @ResponseStatus(HttpStatus.CREATED)
+    @Operation(summary = "Provision a new tenant (ADMIN only)")
+    public OrganizationResponse create(@Valid @RequestBody OrganizationRequest request) {
+        return organizationService.create(request);
+    }
+}

src/main/java/com/slotline/organization/dto/OrganizationRequest.java

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+package com.slotline.organization.dto;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Pattern;
+import jakarta.validation.constraints.Size;
+
+public record OrganizationRequest(
+        @NotBlank @Size(max = 128) String name,
+        @NotBlank @Size(min = 2, max = 64) @Pattern(regexp = "[a-z0-9-]+",
+                message = "slug must be lowercase letters, digits or hyphens") String slug) {
+}

src/main/java/com/slotline/organization/dto/OrganizationResponse.java

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+package com.slotline.organization.dto;
+
+import com.slotline.organization.Organization;
+
+import java.time.Instant;
+
+public record OrganizationResponse(Long id, String name, String slug, Instant createdAt) {
+
+    public static OrganizationResponse from(Organization organization) {
+        return new OrganizationResponse(organization.getId(), organization.getName(), organization.getSlug(),
+                organization.getCreatedAt());
+    }
+}