Add bookmark read-side support: ArticleBookmarksReadService and bookmarked flag in ArticleData

[devin-ai-integration]

Summary

Adds read-side support for bookmarks, following the existing ArticleFavoritesReadService patterns:

• New ArticleBookmarksReadService mapper interface with isUserBookmark, userBookmarks (batch), userBookmarkArticleIds, and countUserBookmarks
• New MyBatis XML with SQL implementations for all four methods
• ArticleData.bookmarked boolean field added (defaults to false)
• ArticleQueryService.fillExtraInfo updated in both overloads to populate the bookmarked flag for authenticated users
• Integration test covering single-article, list, and null-user flows

The userBookmarkArticleIds and countUserBookmarks methods are defined for upcoming bookmark-listing endpoints but are not yet called in this PR.

Review & Testing Checklist for Human

• Verify bookmarked field appears correctly in JSON API responses — Adding this field to ArticleData means it will now be serialized in all article API responses. Confirm this is acceptable for downstream consumers.
• Check SQL in ArticleBookmarksReadService.xml — The userBookmarks query goes directly against article_bookmarks (unlike favorites which joins through articles). Verify this is correct for the article_bookmarks schema from Task 1's migration.
• Validate @AllArgsConstructor field ordering — The new bookmarked boolean sits between favoritesCount (int) and createdAt (DateTime) in ArticleData. All 6 existing test constructor call sites were updated. Compilation passing gives confidence, but worth a quick scan.

Suggested manual test plan: Boot the app, create a user, create an article, bookmark it via the data layer, then GET /articles/{slug} — confirm "bookmarked": true appears. Fetch the same article unauthenticated and confirm "bookmarked" defaults to false.

Notes

• Depends on Task 1 branch devin/1775649236-bookmark-data-layer which provides the article_bookmarks table and write-side infrastructure.
• Two read service methods (userBookmarkArticleIds, countUserBookmarks) are forward-looking for a future bookmarks listing API and have no callers yet.

Link to Devin session: https://app.devin.ai/sessions/23f82d42a45f431e90cd635eb519e96e
Requested by: @schaudhry123

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 3 additional findings.