refactor(media): unify use-case I/O schemas + presenter + feature error map

Per Plan 9 (spec R1-R28):
- Use cases: input + output schemas (getMedia, listMedia); deleteMedia
  has input schema only (void output, R12 — no presenter).
- Controllers: unknown input + identity presenter on getMedia/listMedia;
  Promise<void> on deleteMedia.
- New integrations/api/procedures.ts with mediaProcedure
  ([InputParseError → BAD_REQUEST], [MediaNotFoundError → NOT_FOUND]).
- Router uses mediaProcedure + .input(xInputSchema).
- src/index.ts exports schemas + types; src/ui/index.ts placeholder
  (media has no queries today); package.json adds ./ui subpath.
- R25 + R26 tests added.

Refactor log: §1, §2, §3.1, §3.2, §3.3, §5.1, §5.2, §6.1, §6.2
Spec: R1–R6, R8–R15, R18–R20, R22–R26

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/media/src/application/use-cases/get-media.use-case.ts

@@ -1,15 +1,26 @@
+import { z } from "zod";
+
 import { MediaNotFoundError } from "../../entities/errors/media";
-import type { Media } from "../../entities/models/media";
+import { mediaSchema } from "../../entities/models/media";
 import type { IMediaRepository } from "../repositories/media.repository.interface";
 
+// ── Input ────────────────────────────────────────────────────────────────
+export const getMediaInputSchema = z.object({ id: z.string().min(1) }).strict();
+export type GetMediaInput = z.infer<typeof getMediaInputSchema>;
+
+// ── Output ───────────────────────────────────────────────────────────────
+export const getMediaOutputSchema = mediaSchema;
+export type GetMediaOutput = z.infer<typeof getMediaOutputSchema>;
+
+// ── Use case ─────────────────────────────────────────────────────────────
 export type IGetMediaUseCase = ReturnType<typeof getMediaUseCase>;
 
 export const getMediaUseCase =
   (mediaRepository: IMediaRepository) =>
-  async (input: { id: string }): Promise<Media> => {
+  async (input: GetMediaInput): Promise<GetMediaOutput> => {
     const media = await mediaRepository.getMedia(input.id);
     if (!media) {
       throw new MediaNotFoundError(`Media with id "${input.id}" not found`);
     }
-    return media;
+    return getMediaOutputSchema.parse(media);
   };