feat: 配置版本历史/对比/回滚、国内 IM 通知渠道、阈值告警与 API Token（v1.2.9）

- 配置版本：fsutil 版本化备份（内容相同自动去重），主 nginx.conf 与 VPS vhost 的版本列表/逐行差异/一键回滚，回滚先校验语法与 nginx -t 再写回

- agent 0.12.2：写 vhost 前留版本；nginx -t 校验失败改为恢复上一个可用版本（此前直接删文件），新增域名 vhost 版本端点，双架构二进制已重编

- 通知：补企业微信 / 钉钉 / 飞书机器人，切换预设时服务地址跟随该预设默认值

- 阈值告警：新增 internal/monitor 巡检（CPU/内存/磁盘持续超阈值、隧道连续 N 次未注册），默认关闭，带静默期与恢复通知

- API Token：api_tokens 表 + Authorization Bearer 认证，只读/读写两种范围；令牌管理与改密/退出仅限登录会话

internal/api/middleware_test.go

@@ -0,0 +1,130 @@
+package api
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"github.com/fonu/fonu/internal/auth"
+	"github.com/fonu/fonu/internal/db"
+)
+
+func newTokenTestAuth(t *testing.T, scope string) (*auth.Service, string) {
+	t.Helper()
+	conn, err := db.Open(filepath.Join(t.TempDir(), "fonu.db"))
+	if err != nil {
+		t.Fatalf("open db: %v", err)
+	}
+	t.Cleanup(func() { _ = conn.Close() })
+	if err := db.Migrate(context.Background(), conn, filepath.Join("..", "..", "migrations")); err != nil {
+		t.Fatalf("migrate: %v", err)
+	}
+	svc := auth.New(conn)
+	created, err := svc.CreateAPIToken(context.Background(), "test", scope, time.Time{})
+	if err != nil {
+		t.Fatalf("create token: %v", err)
+	}
+	return svc, created.Token
+}
+
+func okTokenHandler() http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) { w.WriteHeader(http.StatusOK) }
+}
+
+func TestRequireAuthAcceptsReadTokenForGet(t *testing.T) {
+	svc, plain := newTokenTestAuth(t, auth.TokenScopeRead)
+	handler := RequireAuth(svc)(okTokenHandler())
+
+	req := httptest.NewRequest(http.MethodGet, "/api/status", nil)
+	req.Header.Set("Authorization", "Bearer "+plain)
+	rec := httptest.NewRecorder()
+	handler.ServeHTTP(rec, req)
+	if rec.Code != http.StatusOK {
+		t.Fatalf("只读令牌应能读，实际 %d", rec.Code)
+	}
+}
+
+func TestRequireAuthBlocksWriteForReadToken(t *testing.T) {
+	svc, plain := newTokenTestAuth(t, auth.TokenScopeRead)
+	handler := RequireAuth(svc)(okTokenHandler())
+
+	req := httptest.NewRequest(http.MethodDelete, "/api/proxies/1", nil)
+	req.Header.Set("Authorization", "Bearer "+plain)
+	rec := httptest.NewRecorder()
+	handler.ServeHTTP(rec, req)
+	if rec.Code != http.StatusForbidden {
+		t.Fatalf("只读令牌不应能写，实际 %d", rec.Code)
+	}
+}
+
+func TestRequireAuthAllowsWriteForWriteToken(t *testing.T) {
+	svc, plain := newTokenTestAuth(t, auth.TokenScopeWrite)
+	handler := RequireAuth(svc)(okTokenHandler())
+
+	req := httptest.NewRequest(http.MethodPost, "/api/proxies", nil)
+	req.Header.Set("Authorization", "Bearer "+plain)
+	rec := httptest.NewRecorder()
+	handler.ServeHTTP(rec, req)
+	if rec.Code != http.StatusOK {
+		t.Fatalf("写令牌应能写，实际 %d", rec.Code)
+	}
+}
+
+func TestRequireAuthTokenCannotManageTokens(t *testing.T) {
+	// 写令牌也不能管理令牌：否则等于拿令牌给自己提权或无限续期
+	svc, plain := newTokenTestAuth(t, auth.TokenScopeWrite)
+	handler := RequireAuth(svc)(okTokenHandler())
+
+	req := httptest.NewRequest(http.MethodGet, "/api/settings/tokens", nil)
+	req.Header.Set("Authorization", "Bearer "+plain)
+	rec := httptest.NewRecorder()
+	handler.ServeHTTP(rec, req)
+	if rec.Code != http.StatusForbidden {
+		t.Fatalf("令牌管理应只允许登录会话，实际 %d", rec.Code)
+	}
+}
+
+func TestRequireAuthRejectsBadCredentials(t *testing.T) {
+	svc, _ := newTokenTestAuth(t, auth.TokenScopeRead)
+	handler := RequireAuth(svc)(okTokenHandler())
+
+	cases := map[string]string{
+		"未知令牌": "Bearer deadbeef",
+		"错误前缀": "Token abc",
+		"没有凭据": "",
+	}
+	for name, header := range cases {
+		req := httptest.NewRequest(http.MethodGet, "/api/status", nil)
+		if header != "" {
+			req.Header.Set("Authorization", header)
+		}
+		rec := httptest.NewRecorder()
+		handler.ServeHTTP(rec, req)
+		if rec.Code != http.StatusUnauthorized {
+			t.Fatalf("%s 应返回 401，实际 %d", name, rec.Code)
+		}
+	}
+}
+
+func TestBearerTokenParsing(t *testing.T) {
+	cases := map[string]string{
+		"Bearer abc":  "abc",
+		"bearer abc":  "abc",
+		"Bearer  abc": "abc",
+		"Basic abc":   "",
+		"Bearer ":     "",
+		"":            "",
+	}
+	for header, want := range cases {
+		req := httptest.NewRequest(http.MethodGet, "/", nil)
+		if header != "" {
+			req.Header.Set("Authorization", header)
+		}
+		if got := bearerToken(req); got != want {
+			t.Fatalf("Authorization %q 解析为 %q，期望 %q", header, got, want)
+		}
+	}
+}