Add attachment management CRUD to the /uploads API

Complete the read and update faces of the signed-in user's attachment
management over the existing attachments table:

- GET /uploads: paginated list of the user's own attachments, newest
  first, with an optional linked/orphaned filter
- GET /uploads/{uid}: fetch one attachment (owner or admin)
- PATCH /uploads/{uid}: rename the display filename, always preserving
  the original extension (owner or admin, audited as attachment.rename)

Adds get_user_attachments/get_user_attachment data helpers, the
rename_attachment operation, AttachmentRenameForm, the UploadItemOut and
UploadsListOut schemas, the Devii tools list_attachments/get_attachment/
rename_attachment, expanded API reference documentation for the full
lifecycle including delete, and api-tier tests.

devplacepy/database/__init__.py

@@ -37,7 +37,7 @@ from .deepsearch import _ds_now, create_deepsearch_session, update_deepsearch_se
 from .ranking import VOTABLE_TARGETS, STAR_TARGETS, _authors_cache, _ranked_authors, _rank_map, get_top_authors, get_leaderboard, get_user_rank, get_user_stars, clear_user_stars, update_target_stars, soft_delete_engagement, delete_engagement, get_target_owner_uid
 from .comments import _drop_blocked, _build_comment_items, load_comments, get_recent_comments_by_target_uids, get_recent_comments_by_post_uids, load_comments_by_target_uids
 from .content import resolve_by_slug, resolve_object_url, get_uids_by_username_match, text_search_clause, get_daily_topic, get_featured_news, get_trending_topics
-from .attachments_data import get_attachments, get_attachments_by_type, get_news_images_by_uids, delete_attachment_record, delete_attachments, _delete_attachment_file, get_user_media, get_deleted_media
+from .attachments_data import get_attachments, get_attachments_by_type, get_news_images_by_uids, delete_attachment_record, delete_attachments, _delete_attachment_file, get_user_media, get_user_attachments, get_user_attachment, get_deleted_media
 from .stats import _stats_cache, get_site_stats, _analytics_cache, get_platform_analytics, _gist_languages_cache, get_gist_languages
 from .schema import BUG_TABLE_RENAMES, migrate_bug_tables_to_issue_tables, init_db, _refresh_query_planner_stats, OLD_GATEWAY_URL, migrate_ai_gateway_settings, backfill_api_keys, _backfill_gamification
 
@@ -234,6 +234,8 @@ __all__ = [
     "delete_attachments",
     "_delete_attachment_file",
     "get_user_media",
+    "get_user_attachments",
+    "get_user_attachment",
     "get_deleted_media",
     "_stats_cache",
     "get_site_stats",