feat: media picker and image removal

features/remove_legacy_article_image_alias.qa.md

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+# QA procedure: remove_legacy_article_image_alias
+
+Package: `test` (black-box, httptest, in-memory fakes, no live server).
+
+## Setup
+1. Call `validator.InitValidator()`.
+2. Build the article router exactly as `NewArticleRouter` does after the change (no image handler), wrapped in `Verifier`, `Authenticator`, `RequireCurrentToken` and `RequireVerifiedUser`, over fake article, image and user repositories. Reuse `newMultipartFileRequest` and `pngBytes` from `test/media_fixtures_test.go`.
+
+## HTTP checks
+3. `POST /v1/article/1/image` with a valid PNG and a valid cookie -> 404, `Create` never called.
+4. `DELETE /v1/article/1/image/10` with a valid cookie -> 404, image 10 still exists.
+5. `POST /v1/media/` with a valid PNG -> 201 with `id` and `url` (this stays covered by `media_library_http_test.go`; confirm the case still passes after the deletions).
+6. `PATCH /v1/article/1/publish` still answers as in `verified_account_required_http_test.go`.
+
+## Cleanup (Go)
+7. Delete `test/upload_article_image_http_test.go`.
+8. In `test/verified_account_required_http_test.go`: remove the `api/handlers/image` import, the `imageHandler` construction (line 34), the route `r.Post("/{id}/image", ...)` (line 53) and the "unverified user is refused when attaching an image" case (around line 149).
+9. Run `task test` and `task lint`; nothing else may reference `PostLegacyArticleImage` or `handlers/image`.
+
+## Manual verification
+With `task dev`, `curl -i -X POST /v1/article/1/image` with a valid cookie answers 404.