chore: 初始提交 Fonu 1.0.2

- 公网反代：Nginx 状态卡片（版本 / 运行状态 / 配置校验 / 端口监听）
- 部署设置第一、二梯队（HTTPS 开关、安全头、限流、连接数、仅中国大陆 IP）
- 隧道检测兼容 frps v0.68 / v0.71（V2 与旧版端点）
- 恢复被清空的 internal/frp/store.go、internal/api/ddns_handler.go、web/src/views/DdnsView.vue

internal/notify/format.go

@@ -0,0 +1,130 @@
+package notify
+
+import (
+	"strings"
+	"time"
+)
+
+func formatFooter(at time.Time) string {
+	return "Fonu · " + at.Format("2006-01-02 15:04:05")
+}
+
+type eventMeta struct {
+	icon     string
+	category string
+}
+
+type AlertContent struct {
+	Event     string
+	Subject   string
+	PushTitle string
+	PlainBody string
+	HTMLBody  string
+	Category  string
+	Icon      string
+	Detail    string
+	Timestamp time.Time
+}
+
+func FormatAlert(event, title, message string) AlertContent {
+	return FormatAlertAt(event, title, message, time.Now())
+}
+
+func FormatAlertAt(event, title, message string, at time.Time) AlertContent {
+	meta := eventMetaFor(event)
+	title = strings.TrimSpace(title)
+	message = strings.TrimSpace(message)
+	pushTitle := strings.TrimSpace(meta.icon + " " + title)
+	subject := "[Fonu] " + pushTitle
+	footer := formatFooter(at)
+
+	detail := message
+	if detail == "" {
+		detail = "暂无更多详情"
+	}
+
+	plain := strings.Join([]string{
+		pushTitle,
+		strings.Repeat("─", 28),
+		"",
+		detail,
+		"",
+		strings.Repeat("─", 28),
+		footer,
+	}, "\n")
+
+	html := formatTelegramHTML(pushTitle, detail, at)
+
+	return AlertContent{
+		Event:     event,
+		Subject:   subject,
+		PushTitle: pushTitle,
+		PlainBody: plain,
+		HTMLBody:  html,
+		Category:  meta.category,
+		Icon:      meta.icon,
+		Detail:    detail,
+		Timestamp: at,
+	}
+}
+
+func eventMetaFor(event string) eventMeta {
+	switch event {
+	case EventDDNSIPChange:
+		return eventMeta{"🌐", "DDNS"}
+	case EventDDNSFailure:
+		return eventMeta{"⚠️", "DDNS"}
+	case EventCertExpiry:
+		return eventMeta{"📅", "证书"}
+	case EventCertRenewSuccess:
+		return eventMeta{"✅", "证书"}
+	case EventCertRenewFailure:
+		return eventMeta{"❌", "证书"}
+	case EventIPFrequentAccess:
+		return eventMeta{"🛡️", "安全"}
+	case EventLoginFailure:
+		return eventMeta{"🔐", "安全"}
+	case EventNginxReloadFailure:
+		return eventMeta{"⚙️", "系统"}
+	case "test":
+		return eventMeta{"🔔", "系统"}
+	default:
+		return eventMeta{"📣", "告警"}
+	}
+}
+
+func formatTelegramHTML(title, detail string, at time.Time) string {
+	lines := []string{
+		"<b>" + escapeHTML(title) + "</b>",
+		"",
+		"<pre>" + escapeHTML(detail) + "</pre>",
+		"",
+		"<i>" + escapeHTML(formatFooter(at)) + "</i>",
+	}
+	return strings.Join(lines, "\n")
+}
+
+func escapeHTML(s string) string {
+	replacer := strings.NewReplacer(
+		"&", "&amp;",
+		"<", "&lt;",
+		">", "&gt;",
+	)
+	return replacer.Replace(s)
+}
+
+func (c AlertContent) webhookPayload() map[string]string {
+	return map[string]string{
+		"event":     c.Event,
+		"category":  c.Category,
+		"icon":      c.Icon,
+		"title":     strings.TrimPrefix(c.PushTitle, c.Icon+" "),
+		"message":   c.Detail,
+		"formatted": c.PlainBody,
+		"time":      c.Timestamp.UTC().Format(time.RFC3339),
+	}
+}
+
+func (c AlertContent) barkMessage() string {
+	return strings.Join([]string{c.Detail, "", "────────", formatFooter(c.Timestamp)}, "\n")
+}