Add queue tables, quote SQL identifiers (v1.3.0)

- isQueue table option adds queue columns and a (status, available_at)
  index; BunSQLite.queue exposes add, claim, complete, fail and
  release_stale with atomic claims
- Set busy_timeout on connections so workers in separate processes wait
  instead of failing with SQLITE_BUSY
- Quote table and column names with backticks in generated SQL, so
  reserved words (to, order, group) work and unknown columns error
  instead of matching as string literals
- Tests for queue ops, multi-process claims and reserved-word names

Co-Authored-By: Claude Opus 5.5 <[email protected]>

dist/lib/schema/create-db-schema.js

@@ -19,6 +19,11 @@ export default function createDBSchema(params) {
      * Reorder Tables (parents before children with FKs)
      */
     const db_schema = orderDBSchema(params);
+    for (const table of db_schema.tables) {
+        if (table.isQueue && table.isVector) {
+            throw new Error(`Table "${table.tableName}" can't be both a queue and a vector table`);
+        }
+    }
     db.run("PRAGMA foreign_keys = OFF;");
     db.run("BEGIN");
     try {