feat: complete remaining Go backend modules

backend/internal/httpapi/auth_compat_test.go

@@ -0,0 +1,39 @@
+package httpapi
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestAuthCompatibilityEndpoints(t *testing.T) {
+	handler := NewAuthCompatibilityHandler()
+	cases := []struct {
+		path     string
+		status   int
+		location string
+		body     string
+	}{
+		{"/api/auth/login", http.StatusTemporaryRedirect, "https://example.test/auth/login", ""},
+		{"/api/auth/callback", http.StatusTemporaryRedirect, "https://example.test/auth/login?error=callback_failed", ""},
+		{"/api/auth/captcha", http.StatusOK, "", `{"enabled":false,"message":"平台账号登录不使用外部验证码。"}` + "\n"},
+	}
+	for _, tc := range cases {
+		t.Run(tc.path, func(t *testing.T) {
+			r := httptest.NewRequest(http.MethodGet, "https://example.test"+tc.path, nil)
+			w := httptest.NewRecorder()
+			handler.ServeHTTP(w, r)
+			if w.Code != tc.status || w.Header().Get("Location") != tc.location || w.Body.String() != tc.body {
+				t.Fatalf("status=%d location=%q body=%q", w.Code, w.Header().Get("Location"), w.Body.String())
+			}
+		})
+	}
+}
+
+func TestAuthCompatibilityRejectsUnsupportedMethods(t *testing.T) {
+	w := httptest.NewRecorder()
+	NewAuthCompatibilityHandler().ServeHTTP(w, httptest.NewRequest(http.MethodPost, "/api/auth/captcha", nil))
+	if w.Code != http.StatusMethodNotAllowed || w.Header().Get("Allow") != http.MethodGet {
+		t.Fatalf("status=%d allow=%q", w.Code, w.Header().Get("Allow"))
+	}
+}