R50 通知推送：dispatcher 投递服务、业务事件接入与员工推送开关

server/prisma/migrations/20260404123000_r50_notification_push/migration.sql

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+-- CreateEnum
+CREATE TYPE "NotificationDeliveryStatus" AS ENUM ('pending', 'success', 'failed');
+
+-- AlterTable
+ALTER TABLE "employees"
+  ADD COLUMN "notification_push_enabled" BOOLEAN NOT NULL DEFAULT true;
+
+-- CreateTable
+CREATE TABLE "notification_deliveries" (
+  "id" UUID NOT NULL,
+  "notification_id" UUID NOT NULL,
+  "channel_id" UUID NOT NULL,
+  "status" "NotificationDeliveryStatus" NOT NULL,
+  "attempt_no" INTEGER NOT NULL,
+  "result_code" VARCHAR(64),
+  "error_message" TEXT,
+  "response_body" JSONB,
+  "attempted_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+  CONSTRAINT "notification_deliveries_pkey" PRIMARY KEY ("id")
+);
+
+-- AddForeignKey
+ALTER TABLE "notification_deliveries"
+  ADD CONSTRAINT "notification_deliveries_notification_id_fkey"
+  FOREIGN KEY ("notification_id") REFERENCES "notifications"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "notification_deliveries"
+  ADD CONSTRAINT "notification_deliveries_channel_id_fkey"
+  FOREIGN KEY ("channel_id") REFERENCES "notification_channels"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- CreateIndex
+CREATE INDEX "idx_notification_deliveries_notification_attempted"
+  ON "notification_deliveries"("notification_id", "attempted_at");
+
+-- CreateIndex
+CREATE INDEX "idx_notification_deliveries_channel_attempted"
+  ON "notification_deliveries"("channel_id", "attempted_at");
+
+-- CreateIndex
+CREATE INDEX "idx_notification_deliveries_status_attempted"
+  ON "notification_deliveries"("status", "attempted_at");