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/api/nginx_handler.go

@@ -0,0 +1,136 @@
+package api
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/fonu/fonu/internal/service"
+)
+
+type NginxHandler struct {
+	proxy *service.ProxyService
+}
+
+func NewNginxHandler(proxy *service.ProxyService) *NginxHandler {
+	return &NginxHandler{proxy: proxy}
+}
+
+type saveRuleNginxRequest struct {
+	Mode    string  `json:"mode"`
+	Content *string `json:"content"`
+}
+
+type rollbackNginxRequest struct {
+	Backup string `json:"backup"`
+}
+
+func (h *NginxHandler) GetRule(w http.ResponseWriter, r *http.Request) {
+	id, err := parseID(r.PathValue("id"))
+	if err != nil {
+		writeError(r, w, http.StatusBadRequest, "无效的规则 ID")
+		return
+	}
+	view, err := h.proxy.GetRuleNginx(r.Context(), id)
+	if err != nil {
+		writeServiceError(r, w, err)
+		return
+	}
+	writeJSON(w, http.StatusOK, view)
+}
+
+func (h *NginxHandler) PutRule(w http.ResponseWriter, r *http.Request) {
+	id, err := parseID(r.PathValue("id"))
+	if err != nil {
+		writeError(r, w, http.StatusBadRequest, "无效的规则 ID")
+		return
+	}
+	var req saveRuleNginxRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(r, w, http.StatusBadRequest, "请求格式无效")
+		return
+	}
+	view, err := h.proxy.SaveRuleNginx(r.Context(), id, service.SaveRuleNginxInput{
+		Mode:    req.Mode,
+		Content: req.Content,
+	})
+	if err != nil {
+		writeServiceError(r, w, err)
+		return
+	}
+	writeJSON(w, http.StatusOK, view)
+}
+
+func (h *NginxHandler) RollbackRule(w http.ResponseWriter, r *http.Request) {
+	id, err := parseID(r.PathValue("id"))
+	if err != nil {
+		writeError(r, w, http.StatusBadRequest, "无效的规则 ID")
+		return
+	}
+	var req rollbackNginxRequest
+	if r.Body != nil && r.ContentLength != 0 {
+		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+			writeError(r, w, http.StatusBadRequest, "请求格式无效")
+			return
+		}
+	}
+	view, err := h.proxy.RollbackRuleNginx(r.Context(), id, req.Backup)
+	if err != nil {
+		writeServiceError(r, w, err)
+		return
+	}
+	writeJSON(w, http.StatusOK, view)
+}
+
+func (h *NginxHandler) GetGlobal(w http.ResponseWriter, r *http.Request) {
+	view, err := h.proxy.GetGlobalNginx(r.Context())
+	if err != nil {
+		writeServiceError(r, w, err)
+		return
+	}
+	writeJSON(w, http.StatusOK, view)
+}
+
+func (h *NginxHandler) PutGlobal(w http.ResponseWriter, r *http.Request) {
+	var req saveRuleNginxRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(r, w, http.StatusBadRequest, "请求格式无效")
+		return
+	}
+	view, err := h.proxy.SaveGlobalNginx(r.Context(), service.SaveGlobalNginxInput{
+		Mode:    req.Mode,
+		Content: req.Content,
+	})
+	if err != nil {
+		writeServiceError(r, w, err)
+		return
+	}
+	writeJSON(w, http.StatusOK, view)
+}
+
+func (h *NginxHandler) RollbackGlobal(w http.ResponseWriter, r *http.Request) {
+	var req rollbackNginxRequest
+	if r.Body != nil && r.ContentLength != 0 {
+		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+			writeError(r, w, http.StatusBadRequest, "请求格式无效")
+			return
+		}
+	}
+	view, err := h.proxy.RollbackGlobalNginx(r.Context(), req.Backup)
+	if err != nil {
+		writeServiceError(r, w, err)
+		return
+	}
+	writeJSON(w, http.StatusOK, view)
+}
+
+func writeServiceError(r *http.Request, w http.ResponseWriter, err error) {
+	if err == nil {
+		return
+	}
+	msg := err.Error()
+	if msg == "规则不存在" {
+		writeError(r, w, http.StatusNotFound, msg, err)
+		return
+	}
+	writeError(r, w, http.StatusBadRequest, msg, err)
+}