feat(admin): 运营后台（登录/查看/审核编辑/补全）+ 写入API + 审计留痕

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

api/internal/auth/auth_test.go

@@ -0,0 +1,62 @@
+package auth
+
+import (
+	"testing"
+	"time"
+
+	"golang.org/x/crypto/bcrypt"
+)
+
+func newTestAuth(t *testing.T, ttl time.Duration) *Authenticator {
+	t.Helper()
+	hash, err := bcrypt.GenerateFromPassword([]byte("s3cret"), bcrypt.MinCost)
+	if err != nil {
+		t.Fatalf("hash: %v", err)
+	}
+	return New("admin", hash, []byte("test-secret"), ttl)
+}
+
+func TestLoginAndVerify(t *testing.T) {
+	a := newTestAuth(t, time.Hour)
+
+	token, err := a.Login("admin", "s3cret")
+	if err != nil {
+		t.Fatalf("login: %v", err)
+	}
+	sub, err := a.Verify(token)
+	if err != nil {
+		t.Fatalf("verify: %v", err)
+	}
+	if sub != "admin" {
+		t.Fatalf("sub = %q, want admin", sub)
+	}
+}
+
+func TestLoginWrongCredentials(t *testing.T) {
+	a := newTestAuth(t, time.Hour)
+	if _, err := a.Login("admin", "nope"); err == nil {
+		t.Fatal("expected error for wrong password")
+	}
+	if _, err := a.Login("other", "s3cret"); err == nil {
+		t.Fatal("expected error for wrong username")
+	}
+}
+
+func TestVerifyRejectsTampered(t *testing.T) {
+	a := newTestAuth(t, time.Hour)
+	token, _ := a.Login("admin", "s3cret")
+	if _, err := a.Verify(token + "x"); err == nil {
+		t.Fatal("expected bad signature error")
+	}
+	if _, err := a.Verify("not.a.token"); err == nil {
+		t.Fatal("expected malformed/decoding error")
+	}
+}
+
+func TestVerifyRejectsExpired(t *testing.T) {
+	a := newTestAuth(t, -time.Minute)
+	token, _ := a.Login("admin", "s3cret")
+	if _, err := a.Verify(token); err == nil {
+		t.Fatal("expected expired token error")
+	}
+}