fix(saas): P0 安全修复 + P1 功能补全 — 角色提升、Admin 引导、IP 记录、密码修改

P0 安全修复:
- 修复 account update 自角色提升漏洞: 非 admin 用户更新自己时剥离 role 字段
- 添加 Admin 引导机制: accounts 表为空时自动从环境变量创建 super_admin

P1 功能补全:
- 所有 17 个 log_operation 调用点传入真实客户端 IP (ConnectInfo + X-Forwarded-For)
- AuthContext 新增 client_ip 字段, middleware 层自动提取
- main.rs 使用 into_make_service_with_connect_info 启用 SocketAddr 注入
- 新增 PUT /api/v1/auth/password 密码修改端点 (验证旧密码 + argon2 哈希)
- 桌面端 SaaS 设置页添加密码修改 UI (折叠式表单)
- SaaSClient 添加 changePassword() 方法
- 集成测试修复: 注入模拟 ConnectInfo 适配 onshot 测试模式

desktop/src/components/SaaS/SaaSSettings.tsx

@@ -2,7 +2,8 @@ import { useState } from 'react';
 import { useSaaSStore } from '../../store/saasStore';
 import { SaaSLogin } from './SaaSLogin';
 import { SaaSStatus } from './SaaSStatus';
-import { Cloud, Info } from 'lucide-react';
+import { Cloud, Info, KeyRound } from 'lucide-react';
+import { saasClient } from '../../lib/saas-client';
 
 export function SaaSSettings() {
   const isLoggedIn = useSaaSStore((s) => s.isLoggedIn);
@@ -125,6 +126,9 @@ export function SaaSSettings() {
           </div>
         </div>
       )}
+
+      {/* Password change section */}
+      {isLoggedIn && !showLogin && <ChangePasswordSection />}
     </div>
   );
 }
@@ -156,3 +160,121 @@ function CloudFeatureRow({
     </div>
   );
 }
+
+function ChangePasswordSection() {
+  const [isOpen, setIsOpen] = useState(false);
+  const [oldPassword, setOldPassword] = useState('');
+  const [newPassword, setNewPassword] = useState('');
+  const [confirmPassword, setConfirmPassword] = useState('');
+  const [error, setError] = useState<string | null>(null);
+  const [success, setSuccess] = useState(false);
+  const [isSubmitting, setIsSubmitting] = useState(false);
+
+  const handleSubmit = async (e: React.FormEvent) => {
+    e.preventDefault();
+    setError(null);
+    setSuccess(false);
+
+    if (newPassword.length < 8) {
+      setError('新密码至少 8 个字符');
+      return;
+    }
+    if (newPassword !== confirmPassword) {
+      setError('两次输入的新密码不一致');
+      return;
+    }
+
+    setIsSubmitting(true);
+    try {
+      await saasClient.changePassword(oldPassword, newPassword);
+      setSuccess(true);
+      setOldPassword('');
+      setNewPassword('');
+      setConfirmPassword('');
+    } catch (err: unknown) {
+      const message = err instanceof Error ? err.message : '密码修改失败';
+      setError(message);
+    } finally {
+      setIsSubmitting(false);
+    }
+  };
+
+  return (
+    <div className="mt-6">
+      <div
+        className="flex items-center justify-between cursor-pointer"
+        onClick={() => setIsOpen(!isOpen)}
+      >
+        <h2 className="text-sm font-medium text-gray-500 uppercase tracking-wide">
+          账号安全
+        </h2>
+        <span className="text-xs text-gray-400">{isOpen ? '收起' : '展开'}</span>
+      </div>
+
+      {isOpen && (
+        <div className="bg-white rounded-xl border border-gray-200 p-5 shadow-sm mt-3">
+          <div className="flex items-center gap-2 mb-4">
+            <KeyRound className="w-4 h-4 text-gray-400" />
+            <span className="text-sm font-medium text-gray-700">修改密码</span>
+          </div>
+
+          <form onSubmit={handleSubmit} className="space-y-3">
+            <div>
+              <label className="block text-xs font-medium text-gray-500 mb-1">
+                当前密码
+              </label>
+              <input
+                type="password"
+                value={oldPassword}
+                onChange={(e) => setOldPassword(e.target.value)}
+                required
+                className="w-full px-3 py-2 text-sm border border-gray-200 rounded-lg focus:outline-none focus:ring-2 focus:ring-emerald-500 focus:border-transparent"
+              />
+            </div>
+            <div>
+              <label className="block text-xs font-medium text-gray-500 mb-1">
+                新密码
+              </label>
+              <input
+                type="password"
+                value={newPassword}
+                onChange={(e) => setNewPassword(e.target.value)}
+                required
+                minLength={8}
+                className="w-full px-3 py-2 text-sm border border-gray-200 rounded-lg focus:outline-none focus:ring-2 focus:ring-emerald-500 focus:border-transparent"
+              />
+            </div>
+            <div>
+              <label className="block text-xs font-medium text-gray-500 mb-1">
+                确认新密码
+              </label>
+              <input
+                type="password"
+                value={confirmPassword}
+                onChange={(e) => setConfirmPassword(e.target.value)}
+                required
+                minLength={8}
+                className="w-full px-3 py-2 text-sm border border-gray-200 rounded-lg focus:outline-none focus:ring-2 focus:ring-emerald-500 focus:border-transparent"
+              />
+            </div>
+
+            {error && (
+              <p className="text-xs text-red-500">{error}</p>
+            )}
+            {success && (
+              <p className="text-xs text-emerald-600">密码修改成功</p>
+            )}
+
+            <button
+              type="submit"
+              disabled={isSubmitting}
+              className="w-full py-2 text-sm font-medium text-white bg-emerald-600 rounded-lg hover:bg-emerald-700 disabled:opacity-50 transition-colors"
+            >
+              {isSubmitting ? '修改中...' : '修改密码'}
+            </button>
+          </form>
+        </div>
+      )}
+    </div>
+  );
+}