feat(db): 0000 站点域——sites/site_config_revisions + 唯一约束

drizzle-kit 首个迁移从 0000 起编号（计划文案写 0001，以实际产出为准）。
迁移文件 + meta/_journal.json + snapshot 一并入库。

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

apps/api/drizzle/0000_pale_sumo.sql

@@ -0,0 +1,22 @@
+CREATE TABLE "site_config_revisions" (
+	"id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL,
+	"site_id" uuid NOT NULL,
+	"version" integer NOT NULL,
+	"data" jsonb NOT NULL,
+	"checksum" text NOT NULL,
+	"created_at" timestamp with time zone DEFAULT now() NOT NULL
+);
+--> statement-breakpoint
+CREATE TABLE "sites" (
+	"id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL,
+	"key" text NOT NULL,
+	"name" text NOT NULL,
+	"default_locale" text NOT NULL,
+	"production_origin" text NOT NULL,
+	"created_at" timestamp with time zone DEFAULT now() NOT NULL,
+	"updated_at" timestamp with time zone DEFAULT now() NOT NULL,
+	CONSTRAINT "sites_key_unique" UNIQUE("key")
+);
+--> statement-breakpoint
+ALTER TABLE "site_config_revisions" ADD CONSTRAINT "site_config_revisions_site_id_sites_id_fk" FOREIGN KEY ("site_id") REFERENCES "public"."sites"("id") ON DELETE no action ON UPDATE no action;--> statement-breakpoint
+CREATE UNIQUE INDEX "site_config_rev_uq" ON "site_config_revisions" USING btree ("site_id","version");