refactor: Gitea 式目录改组，移除本分支 SPA 与杂项产物

将 model/service/handler/middleware 迁至 models/services/routers/api/modules/auth，并删除 frontend、embed_static、scripts 及误入库缓存/二进制。

Co-authored-by: Cursor <cursoragent@cursor.com>

services/crawler.go

@@ -0,0 +1,55 @@
+package service
+
+import "strings"
+
+// 常见搜索引擎 / 社交预览 / SEO 工具的 User-Agent 片段（小写匹配）
+var seoCrawlerTokens = []string{
+	"googlebot",
+	"google-inspectiontool",
+	"bingbot",
+	"baiduspider",
+	"yandexbot",
+	"duckduckbot",
+	"slurp", // Yahoo
+	"sogou",
+	"bytespider",
+	"petalbot",
+	"applebot",
+	"facebookexternalhit",
+	"facebot",
+	"twitterbot",
+	"linkedinbot",
+	"discordbot",
+	"telegrambot",
+	"slackbot",
+	"whatsapp",
+	"preview", // 部分通用预览 UA
+	"embedly",
+	"quora link preview",
+	"pinterest",
+	"vkshare",
+	"w3c_validator",
+	"ahrefsbot",
+	"semrushbot",
+	"dotbot",
+	"mj12bot",
+	"gptbot",
+	"claudebot",
+	"anthropic-ai",
+	"chatgpt-user",
+	"oai-searchbot",
+}
+
+// IsSEOCrawler 是否为需要服务端 HTML 的爬虫 / 预览 bot（动态渲染）
+func IsSEOCrawler(userAgent string) bool {
+	ua := strings.ToLower(strings.TrimSpace(userAgent))
+	if ua == "" {
+		return false
+	}
+	for _, token := range seoCrawlerTokens {
+		if strings.Contains(ua, token) {
+			return true
+		}
+	}
+	return false
+}