feat: 品牌重命名 Sub2API -> TianShuAPI (基于官方 v0.1.56)

基于官方最新代码 upstream/main (dae0d53)

新功能：
- 添加 5小时窗口费用控制和会话数量限制
- Caddy 静态资源长期缓存配置
- 前端性能优化（路由预加载、移除 Google Fonts 改用系统字体）
- 修复 api_contract_test 缺少 SessionLimitCache 参数问题

品牌修改：
- 仅修改品牌显示名称为 TianShuAPI
- 保持所有功能完整
- 恢复 docker-compose.1panel.yml 配置文件

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

frontend/src/components/layout/AuthLayout.vue

@@ -65,7 +65,7 @@ import { ref, computed, onMounted } from 'vue'
 import { getPublicSettings } from '@/api/auth'
 import { sanitizeUrl } from '@/utils/url'
 
-const siteName = ref('Sub2API')
+const siteName = ref('TianShuAPI')
 const siteLogo = ref('')
 const siteSubtitle = ref('Subscription to API Conversion Platform')
 
@@ -74,7 +74,7 @@ const currentYear = computed(() => new Date().getFullYear())
 onMounted(async () => {
   try {
     const settings = await getPublicSettings()
-    siteName.value = settings.site_name || 'Sub2API'
+    siteName.value = settings.site_name || 'TianShuAPI'
     siteLogo.value = sanitizeUrl(settings.site_logo || '', { allowRelative: true })
     siteSubtitle.value = settings.site_subtitle || 'Subscription to API Conversion Platform'
   } catch (error) {