feat(rate-limit): 多层级并发 UA 限制

drizzle/0078_wild_scourge.sql

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+ALTER TABLE "keys" ADD COLUMN "limit_concurrent_uas" integer DEFAULT 0;--> statement-breakpoint
+ALTER TABLE "providers" ADD COLUMN "limit_concurrent_uas" integer DEFAULT 0;--> statement-breakpoint
+ALTER TABLE "users" ADD COLUMN "limit_concurrent_uas" integer;--> statement-breakpoint
+ALTER TABLE "keys"
+  ADD CONSTRAINT "keys_limit_concurrent_uas_non_negative"
+  CHECK ("limit_concurrent_uas" >= 0);--> statement-breakpoint
+ALTER TABLE "providers"
+  ADD CONSTRAINT "providers_limit_concurrent_uas_non_negative"
+  CHECK ("limit_concurrent_uas" >= 0);--> statement-breakpoint
+ALTER TABLE "users"
+  ADD CONSTRAINT "users_limit_concurrent_uas_non_negative"
+  CHECK ("limit_concurrent_uas" IS NULL OR "limit_concurrent_uas" >= 0);