chore(db): 删除废弃的 Better Auth OAuth 表

chore(db): drop obsolete Better Auth OAuth tables

Author: du2333

migrations/0008_strong_callisto.sql

@@ -0,0 +1,5 @@
+DROP TABLE `jwks`;--> statement-breakpoint
+DROP TABLE `oauth_access_token`;--> statement-breakpoint
+DROP TABLE `oauth_client`;--> statement-breakpoint
+DROP TABLE `oauth_consent`;--> statement-breakpoint
+DROP TABLE `oauth_refresh_token`;