Add demo mode factory reset

- Align the backend seeded default surgery template with the report editor's default report content.

- Add backend demo defaults for the default template, Kimi provider, and Xunfei speech proxy configuration.

- Change system reset into a super-admin demo mode factory reset that clears reports, audit logs, files, custom templates, and non-default users.

- Keep only the default admin, manager, doctor, and default surgery template after demo reset.

- Replace the old local-only reset all data button with a two-confirmation backend reset flow.

- Add tests covering demo default alignment and database-backed demo reset behavior.

- Update docs to describe demo mode reset semantics and production credential cautions.

server/prisma/seed.ts

@@ -1,6 +1,11 @@
 import { PrismaClient } from '@prisma/client';
 import { PrismaPg } from '@prisma/adapter-pg';
 import argon2 from 'argon2';
+import {
+  DEMO_DEFAULT_REPORT_CONTENT,
+  DEMO_SYSTEM_SETTINGS,
+  DEMO_TEMPLATE_ID,
+} from '../src/demo/demo-defaults.js';
 
 if (!process.env.DATABASE_URL) {
   throw new Error('DATABASE_URL is required to seed the database');
@@ -12,16 +17,6 @@ const prisma = new PrismaClient({
   }),
 });
 
-const defaultTemplateContent = `
-<h1 style="text-align:center;">手术记录</h1>
-<p>患者姓名：<span class="field-value" data-bind="patientName" contenteditable="true"></span></p>
-<p>住院号：<span class="field-value" data-bind="hospitalId" contenteditable="true"></span></p>
-<p>手术名称：<span class="field-value" data-bind="title" contenteditable="true"></span></p>
-<div class="ai-region" data-ai-id="手术步骤" data-ai-title="手术步骤">
-  <div class="ai-content"><p>请在此处填写手术步骤。</p></div>
-</div>
-`;
-
 const main = async () => {
   const tenant = await prisma.tenant.upsert({
     where: { code: 'default' },
@@ -94,14 +89,22 @@ const main = async () => {
   });
 
   const defaultTemplate = await prisma.template.upsert({
-    where: { id: 'tpl_default_surgery' },
-    update: {},
+    where: { id: DEMO_TEMPLATE_ID },
+    update: {
+      name: '腹腔镜胆囊切除术报告',
+      description: '标准手术记录模板',
+      content: DEMO_DEFAULT_REPORT_CONTENT,
+      fields: [],
+      scope: 'DEPARTMENT',
+      ownerDepartmentId: surgeryDepartment.id,
+      ownerUserId: null,
+    },
     create: {
-      id: 'tpl_default_surgery',
+      id: DEMO_TEMPLATE_ID,
       tenantId: tenant.id,
       name: '腹腔镜胆囊切除术报告',
       description: '标准手术记录模板',
-      content: defaultTemplateContent,
+      content: DEMO_DEFAULT_REPORT_CONTENT,
       fields: [],
       scope: 'DEPARTMENT',
       ownerDepartmentId: surgeryDepartment.id,
@@ -128,6 +131,25 @@ const main = async () => {
     },
   });
 
+  const existingSystemSettings = await prisma.systemSetting.findFirst({
+    where: { tenantId: tenant.id, scope: 'global', departmentId: null, key: 'systemSettings' },
+  });
+  if (existingSystemSettings) {
+    await prisma.systemSetting.update({
+      where: { id: existingSystemSettings.id },
+      data: { value: DEMO_SYSTEM_SETTINGS },
+    });
+  } else {
+    await prisma.systemSetting.create({
+      data: {
+        tenantId: tenant.id,
+        scope: 'global',
+        key: 'systemSettings',
+        value: DEMO_SYSTEM_SETTINGS,
+      },
+    });
+  }
+
   await prisma.auditLog.create({
     data: {
       tenantId: tenant.id,