sync: bring over remaining release/custom-0.1.115 changes

- Extract PublicSettingsInjectionPayload named struct with drift test
- Add channel_monitor_default_interval_seconds to SSR injection
- Add image_output_price to SupportedModelChip
- Simplify AppSidebar buildSelfNavItems (admins see available channels)
- Add gateway WARN logs for 503 no-available-accounts branches
- Wire ChannelMonitorRunner into provideCleanup for graceful shutdown
- Add migrations 130/131 (CC template userid fix + mimicry field cleanup)
- Clean up fork-only features (sora, claude max simulation, client affinity)
- Remove ~320 obsolete i18n keys
- Add codexUsage utility, WechatServiceButton, BulkEditAccountModal
- Tidy go.sum

backend/internal/service/openai_images_test.go

@@ -2,7 +2,6 @@ package service
 
 import (
 	"bytes"
-	"context"
 	"mime/multipart"
 	"net/http"
 	"net/http/httptest"
@@ -104,56 +103,3 @@ func TestOpenAIGatewayServiceParseOpenAIImagesRequest_ExplicitSizeRequiresNative
 	require.NotNil(t, parsed)
 	require.Equal(t, OpenAIImagesCapabilityNative, parsed.RequiredCapability)
 }
-
-func TestOpenAIGatewayServiceParseOpenAIImagesRequest_RejectsNonImageModel(t *testing.T) {
-	gin.SetMode(gin.TestMode)
-	body := []byte(`{"model":"gpt-5.4","prompt":"draw a cat"}`)
-
-	req := httptest.NewRequest(http.MethodPost, "/v1/images/generations", bytes.NewReader(body))
-	req.Header.Set("Content-Type", "application/json")
-	rec := httptest.NewRecorder()
-	c, _ := gin.CreateTestContext(rec)
-	c.Request = req
-
-	svc := &OpenAIGatewayService{}
-	parsed, err := svc.ParseOpenAIImagesRequest(c, body)
-	require.Nil(t, parsed)
-	require.ErrorContains(t, err, `images endpoint requires an image model, got "gpt-5.4"`)
-}
-
-func TestCollectOpenAIImagePointers_RecognizesDirectAssets(t *testing.T) {
-	items := collectOpenAIImagePointers([]byte(`{
-		"revised_prompt": "cat astronaut",
-		"parts": [
-			{"b64_json":"QUJD"},
-			{"download_url":"https://files.example.com/image.png?sig=1"},
-			{"asset_pointer":"file-service://file_123"}
-		]
-	}`))
-
-	require.Len(t, items, 3)
-	var sawBase64, sawURL, sawPointer bool
-	for _, item := range items {
-		if item.B64JSON == "QUJD" {
-			sawBase64 = true
-			require.Equal(t, "cat astronaut", item.Prompt)
-		}
-		if item.DownloadURL == "https://files.example.com/image.png?sig=1" {
-			sawURL = true
-		}
-		if item.Pointer == "file-service://file_123" {
-			sawPointer = true
-		}
-	}
-	require.True(t, sawBase64)
-	require.True(t, sawURL)
-	require.True(t, sawPointer)
-}
-
-func TestResolveOpenAIImageBytes_PrefersInlineBase64(t *testing.T) {
-	data, err := resolveOpenAIImageBytes(context.Background(), nil, nil, "", openAIImagePointerInfo{
-		B64JSON: "data:image/png;base64,QUJD",
-	})
-	require.NoError(t, err)
-	require.Equal(t, []byte("ABC"), data)
-}