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_codex_transform_test.go

@@ -217,42 +217,6 @@ func TestApplyCodexOAuthTransform_NormalizeCodexTools_PreservesResponsesFunction
 	require.Equal(t, "bash", first["name"])
 }
 
-func TestNormalizeOpenAIResponsesImageGenerationTools_RewritesLegacyFields(t *testing.T) {
-	reqBody := map[string]any{
-		"tools": []any{
-			map[string]any{
-				"type":        "image_generation",
-				"format":      "png",
-				"compression": 60,
-			},
-		},
-	}
-
-	modified := normalizeOpenAIResponsesImageGenerationTools(reqBody)
-	require.True(t, modified)
-
-	tools, ok := reqBody["tools"].([]any)
-	require.True(t, ok)
-	first, ok := tools[0].(map[string]any)
-	require.True(t, ok)
-	require.Equal(t, "png", first["output_format"])
-	require.Equal(t, 60, first["output_compression"])
-	_, hasFormat := first["format"]
-	require.False(t, hasFormat)
-	_, hasCompression := first["compression"]
-	require.False(t, hasCompression)
-}
-
-func TestValidateOpenAIResponsesImageModel_RejectsImageOnlyModel(t *testing.T) {
-	err := validateOpenAIResponsesImageModel(map[string]any{
-		"tools": []any{
-			map[string]any{"type": "image_generation"},
-		},
-	}, "gpt-image-2")
-
-	require.ErrorContains(t, err, `/v1/responses image_generation requests require a Responses-capable text model`)
-}
-
 func TestApplyCodexOAuthTransform_EmptyInput(t *testing.T) {
 	// 空 input 应保持为空且不触发异常。