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/ddns/domain_records.go

@@ -0,0 +1,63 @@
+package ddns
+
+import (
+	"encoding/json"
+	"strings"
+)
+
+type DomainRecord struct {
+	Domain  string `json:"domain"`
+	IPv4    string `json:"ipv4,omitempty"`
+	IPv6    string `json:"ipv6,omitempty"`
+	Status  string `json:"status"`
+	Message string `json:"message,omitempty"`
+}
+
+func EncodeDomainRecords(records []DomainRecord) string {
+	if len(records) == 0 {
+		return "[]"
+	}
+	b, err := json.Marshal(records)
+	if err != nil {
+		return "[]"
+	}
+	return string(b)
+}
+
+func DecodeDomainRecords(raw string) []DomainRecord {
+	raw = strings.TrimSpace(raw)
+	if raw == "" || raw == "[]" {
+		return nil
+	}
+	var records []DomainRecord
+	if err := json.Unmarshal([]byte(raw), &records); err != nil {
+		return nil
+	}
+	return records
+}
+
+func BuildDomainRecords(cfg Config) []DomainRecord {
+	stored := cfg.DomainRecords
+	byDomain := make(map[string]DomainRecord, len(stored))
+	for _, rec := range stored {
+		byDomain[strings.ToLower(rec.Domain)] = rec
+	}
+
+	lines := cfg.DomainLines()
+	out := make([]DomainRecord, 0, len(lines))
+	for _, domain := range lines {
+		key := strings.ToLower(domain)
+		if rec, ok := byDomain[key]; ok {
+			rec.Domain = domain
+			out = append(out, rec)
+			continue
+		}
+		rec := DomainRecord{Domain: domain, Status: "unknown"}
+		if cfg.LastStatus != "" && cfg.LastStatus != "unknown" {
+			rec.Status = cfg.LastStatus
+			rec.Message = cfg.LastError
+		}
+		out = append(out, rec)
+	}
+	return out
+}