refactor: 整理项目根目录结构

整理内容:
- 删除 60+ 临时测试输出文件 (*.txt)
- 移动二进制文件到 bin/ 目录
- 移动 Shell 脚本到 scripts/ 目录
  - scripts/dev/: check_gitea.sh, check_sub2api.sh, run_tests.sh
  - scripts/deploy/: deploy_*.sh, simple_deploy.sh
  - scripts/ops/: fix_nginx.sh, fix_ssl.sh, install_docker.sh
  - scripts/test/: test_*.sh, test_*.bat
- 移动批处理文件到 scripts/
- 移动 Python 脚本到 tools/
- 清理临时日志文件

保留根目录必要文件:
- go.mod, go.sum, go.work
- Makefile, docker-compose.yml
- .env.example, .gitignore
- README.md, AGENTS.md, DEPLOY_GUIDE.md

验证: go build ./... && go test ./... 通过

frontend/admin/src/services/settings.ts

@@ -0,0 +1,58 @@
+/**
+ * 系统设置服务
+ *
+ * 提供系统设置 API 调用
+ */
+
+import { get } from '@/lib/http/client'
+
+export interface SystemInfo {
+  name: string
+  version: string
+  environment: string
+  description: string
+}
+
+export interface SecurityInfo {
+  password_min_length: number
+  password_require_uppercase: boolean
+  password_require_lowercase: boolean
+  password_require_numbers: boolean
+  password_require_symbols: boolean
+  password_history: number
+  totp_enabled: boolean
+  login_fail_lock: boolean
+  login_fail_threshold: number
+  login_fail_duration: number
+  session_timeout: number
+  device_trust_duration: number
+}
+
+export interface FeaturesInfo {
+  email_verification: boolean
+  phone_verification: boolean
+  oauth_providers: string[]
+  sso_enabled: boolean
+  operation_log_enabled: boolean
+  login_log_enabled: boolean
+  data_export_enabled: boolean
+  data_import_enabled: boolean
+}
+
+export interface SystemSettings {
+  system: SystemInfo
+  security: SecurityInfo
+  features: FeaturesInfo
+}
+
+interface SettingsResponse {
+  data: SystemSettings
+}
+
+/**
+ * 获取系统设置
+ * GET /api/v1/admin/settings
+ */
+export function getSettings(): Promise<SystemSettings> {
+  return get<SettingsResponse>('/admin/settings').then(res => res.data)
+}