R57 A1-A6：报销模板与差旅申请关联

server/prisma/migrations/20260408120000_r57_reimbursement_templates/migration.sql

@@ -0,0 +1,28 @@
+CREATE TABLE "reimbursement_templates" (
+    "id" UUID NOT NULL,
+    "name" VARCHAR(100) NOT NULL,
+    "description" TEXT,
+    "items" JSONB NOT NULL DEFAULT '[]',
+    "sort_order" INTEGER NOT NULL DEFAULT 0,
+    "enabled" BOOLEAN NOT NULL DEFAULT true,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "created_by" UUID,
+    "updated_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updated_by" UUID,
+
+    CONSTRAINT "reimbursement_templates_pkey" PRIMARY KEY ("id")
+);
+
+CREATE INDEX "reimbursement_templates_enabled_sort_order_idx"
+ON "reimbursement_templates"("enabled", "sort_order");
+
+ALTER TABLE "reimbursement_forms"
+ADD COLUMN "linked_travel_request_id" UUID;
+
+CREATE INDEX "idx_reimbursement_forms_linked_travel_request"
+ON "reimbursement_forms"("linked_travel_request_id");
+
+ALTER TABLE "reimbursement_forms"
+ADD CONSTRAINT "reimbursement_forms_linked_travel_request_id_fkey"
+FOREIGN KEY ("linked_travel_request_id") REFERENCES "travel_requests"("id")
+ON DELETE SET NULL ON UPDATE CASCADE;