feat(db): add self-tuned mariadb-turbo container and bulk JSON importer

- docker-compose: opt-in mariadb-turbo service (profile 'db') with inline
  mysqld tuning (max_allowed_packet=512M, innodb_flush_log_at_trx_commit=2,
  2G buffer pool, net_read/write_timeout=600) for >50 MB JSON bulk loads;
  named volume for the datadir + node_modules host-sync guidance
- scripts/bulk-import-json.ts: chunked (2000-row) idempotent importer with
  ON DUPLICATE KEY UPDATE, resumable, habbo furnidata or flat-array input
- src/db/schema-gamedata.ts: promote+index JSON storage schema (furnidata,
  docs, texts) incl. VIRTUAL generated columns for MariaDB
- package.json: add db:bulk, db:up, db:down, db:introspect, db:schema:generate

package.json

@@ -21,6 +21,11 @@
 		"test:e2e": "playwright test",
 		"typecheck": "tsc --noEmit",
 		"db:generate": "drizzle-kit generate",
+		"db:introspect": "drizzle-kit introspect",
+		"db:bulk": "tsx scripts/bulk-import-json.ts",
+		"db:up": "docker compose --profile db up -d mariadb-turbo",
+		"db:down": "docker compose --profile db stop mariadb-turbo",
+		"db:schema:generate": "node scripts/generate-drizzle-schema.mjs",
 		"db:migrate": "tsx scripts/apply-migrations.ts",
 		"db:migrate:status": "tsx scripts/apply-migrations.ts --status",
 		"db:studio": "drizzle-kit studio",