feat(media): scaffold feature package with media collection only

packages/media/src/index.ts

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+export {};

packages/media/src/integrations/cms/collections/media.ts

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+import type { CollectionConfig } from "payload";
+
+export const media: CollectionConfig = {
+  slug: "media",
+  upload: {
+    mimeTypes: ["image/*", "application/pdf"],
+  },
+  admin: {
+    useAsTitle: "filename",
+  },
+  fields: [
+    {
+      name: "alt",
+      type: "text",
+      required: true,
+    },
+  ],
+};

packages/media/src/integrations/cms/index.ts

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+export { media } from "./collections/media";