feat(pages): add pages table schema and sqlc queries

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

sql/queries/pages.sql

@@ -0,0 +1,34 @@
+-- name: SelectPagesOfSite :many
+SELECT * FROM pages
+WHERE site_id = ? ORDER BY sort_order ASC;
+
+-- name: SelectPage :one
+SELECT * FROM pages WHERE id = ? LIMIT 1;
+
+-- name: SelectPageByGUID :one
+SELECT * FROM pages WHERE guid = ? LIMIT 1;
+
+-- name: SelectPageBySlugAndSite :one
+SELECT * FROM pages WHERE site_id = ? AND slug = ? LIMIT 1;
+
+-- name: InsertPage :one
+INSERT INTO pages (
+    site_id, guid, title, slug, body, page_type, show_in_nav, sort_order, created_at, updated_at
+) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+RETURNING id;
+
+-- name: UpdatePage :exec
+UPDATE pages SET
+    title = ?,
+    slug = ?,
+    body = ?,
+    page_type = ?,
+    show_in_nav = ?,
+    updated_at = ?
+WHERE id = ?;
+
+-- name: UpdatePageSortOrder :exec
+UPDATE pages SET sort_order = ? WHERE id = ?;
+
+-- name: DeletePage :exec
+DELETE FROM pages WHERE id = ?;