chore(db): retire the nine dead annotation plain queries + duplicate SQL line

H3 leftover: the annotation handlers route everything through the sync
service (dedup/LWW/tombstones), leaving the plain Create/Update/Delete
queries for media_notes/media_highlights/media_bookmarks with zero
callers repo-wide (handlers, services, tests). Queries.sql drops them
so H4's row work doesn't carry dead weight; sqlc regen compiles clean,
proving nothing referenced the generated stubs.

Also removes the literal duplicate `AND mi.missing_scan_count = 0`
line in the library-stats query (harmless but confusing).

internal/database/queries/queries.sql

@@ -920,54 +920,19 @@ ORDER BY score DESC, count DESC
 LIMIT sqlc.narg('limit') OFFSET sqlc.narg('offset');
 
 -- Media Notes queries
--- name: CreateMediaNote :one
-INSERT INTO media_notes (media_item_id, user_id, content, position)
-VALUES ($1, $2, $3, $4)
-RETURNING *;
-
 -- name: GetMediaNote :one
 SELECT * FROM media_notes WHERE id = $1;
 
 -- name: GetMediaNotes :many
 SELECT * FROM media_notes WHERE media_item_id = $1 AND user_id = $2 AND COALESCE(deleted, FALSE) = FALSE ORDER BY created_at DESC;
 
--- name: UpdateMediaNote :one
-UPDATE media_notes SET
-    content = $2,
-    position = $3,
-    updated_at = NOW()
-WHERE id = $1 AND user_id = $4
-RETURNING *;
-
--- name: DeleteMediaNote :exec
-DELETE FROM media_notes WHERE id = $1 AND user_id = $2;
-
 -- Media Highlights queries
--- name: CreateMediaHighlight :one
-INSERT INTO media_highlights (media_item_id, user_id, selection_text, start_position, end_position, color, note_id)
-VALUES ($1, $2, $3, $4, $5, $6, $7)
-RETURNING *;
-
 -- name: GetMediaHighlight :one
 SELECT * FROM media_highlights WHERE id = $1;
 
 -- name: GetMediaHighlights :many
 SELECT * FROM media_highlights WHERE media_item_id = $1 AND user_id = $2 AND COALESCE(deleted, FALSE) = FALSE ORDER BY created_at DESC;
 
--- name: UpdateMediaHighlight :one
-UPDATE media_highlights SET
-    selection_text = $2,
-    start_position = $3,
-    end_position = $4,
-    color = $5,
-    note_id = $6,
-    updated_at = NOW()
-WHERE id = $1 AND user_id = $7
-RETURNING *;
-
--- name: DeleteMediaHighlight :exec
-DELETE FROM media_highlights WHERE id = $1 AND user_id = $2;
-
 -- ============================================
 -- ANNOTATION SYNC QUERIES (highlights)
 -- ============================================
@@ -3038,25 +3003,6 @@ ORDER BY created_at DESC;
 -- name: GetMediaBookmark :one
 SELECT * FROM media_bookmarks WHERE id = $1;
 
--- name: CreateMediaBookmark :one
-INSERT INTO media_bookmarks (media_item_id, user_id, page_number, chapter_number, cfi_position, title, position, notes)
-VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
-RETURNING *;
-
--- name: DeleteMediaBookmark :exec
-DELETE FROM media_bookmarks
-WHERE id = $1 AND user_id = $2;
-
--- name: UpdateMediaBookmark :one
-UPDATE media_bookmarks
-SET
-    title = $2,
-    notes = $3,
-    position = $4,
-    last_modified_at = NOW()
-WHERE id = $1 AND user_id = $5
-RETURNING *;
-
 -- ============================================================================
 -- PROCESSING ISSUES QUERIES
 -- ============================================================================