feat(server): 完成 P0+P1 后端能力（工作流、RBAC、付款归档）

P0 MVP：

- 认证：login/refresh/logout/forgot/reset + tokenVersion

- RBAC：角色到权限映射 + requirePermission

- 发票池：upload/bind/signed-url + 判重（VALID_003/VALID_005）

- 报销：create/view/submit + 单号生成

- 工作流：approve + department_manager 解析

P1 扩展：

- 动作：reject/return/withdraw（含 comment）

- transfer：任务转审 + 链路上限 3

- pay：approved -> paid + 发票归档 used_complete

- 动态审批链：approval_rules 驱动

回归脚本：

- smoke-test.sh / regression-dedup.sh / regression-workflow-actions.sh

server/src/plugins/prisma.js

@@ -0,0 +1,16 @@
+const { createPrismaClient } = require("../prismaClient");
+const fp = require("fastify-plugin");
+
+async function prismaPlugin(fastify) {
+  const { prisma, pool } = createPrismaClient();
+  await prisma.$connect();
+
+  fastify.decorate("prisma", prisma);
+
+  fastify.addHook("onClose", async (instance) => {
+    await instance.prisma.$disconnect();
+    await pool.end();
+  });
+}
+
+module.exports = fp(prismaPlugin, { name: "prisma" });