feat(blog): add PayloadArticlesRepository with doc-to-entity mapping

packages/blog/src/infrastructure/repositories/payload-articles.repository.test.ts

@@ -0,0 +1,59 @@
+import { describe, expect, it, vi } from "vitest";
+import { PayloadArticlesRepository } from "./payload-articles.repository";
+
+vi.mock("payload", () => ({
+  getPayload: vi.fn(),
+}));
+
+vi.mock("@repo/core-cms", () => ({
+  default: {} as never,
+}));
+
+describe("PayloadArticlesRepository", () => {
+  it("maps a Payload doc to a domain Article on getArticleBySlug", async () => {
+    const { getPayload } = await import("payload");
+    const findMock = vi.fn().mockResolvedValue({
+      docs: [
+        {
+          id: "p-123",
+          title: "Hello",
+          slug: "hello",
+          content: { type: "doc", children: [] },
+          status: "published",
+          author: "u1",
+          createdAt: "2026-05-04T12:00:00.000Z",
+          updatedAt: "2026-05-04T12:00:00.000Z",
+        },
+      ],
+    });
+    (getPayload as ReturnType<typeof vi.fn>).mockResolvedValue({
+      find: findMock,
+    });
+
+    const repo = new PayloadArticlesRepository();
+    const result = await repo.getArticleBySlug("hello");
+
+    expect(findMock).toHaveBeenCalledWith({
+      collection: "articles",
+      where: { slug: { equals: "hello" } },
+      limit: 1,
+      overrideAccess: false,
+    });
+    expect(result?.id).toBe("p-123");
+    expect(result?.slug).toBe("hello");
+    expect(result?.status).toBe("published");
+    expect(result?.authorId).toBe("u1");
+    expect(result?.createdAt).toBeInstanceOf(Date);
+  });
+
+  it("returns undefined when slug is not found", async () => {
+    const { getPayload } = await import("payload");
+    (getPayload as ReturnType<typeof vi.fn>).mockResolvedValue({
+      find: vi.fn().mockResolvedValue({ docs: [] }),
+    });
+
+    const repo = new PayloadArticlesRepository();
+    const result = await repo.getArticleBySlug("missing");
+    expect(result).toBeUndefined();
+  });
+});