chore(openai): remove gpt-5.3-codex from OpenAI default model list

移除 OpenAI OAuth 账号默认模型列表中的 gpt-5.3-codex（后端 DefaultModels、前端 openai 白名单及 UseKeyModal 目录），保留 gpt-5.3-codex-spark 与计费/别名/messages-dispatch 相关逻辑不变。

backend/internal/pkg/openai/constants.go

@@ -21,7 +21,6 @@ var DefaultModels = []Model{
 	{ID: "gpt-5.5", Object: "model", Created: 1776873600, OwnedBy: "openai", Type: "model", DisplayName: "GPT-5.5"},
 	{ID: "gpt-5.4", Object: "model", Created: 1738368000, OwnedBy: "openai", Type: "model", DisplayName: "GPT-5.4"},
 	{ID: "gpt-5.4-mini", Object: "model", Created: 1738368000, OwnedBy: "openai", Type: "model", DisplayName: "GPT-5.4 Mini"},
-	{ID: "gpt-5.3-codex", Object: "model", Created: 1735689600, OwnedBy: "openai", Type: "model", DisplayName: "GPT-5.3 Codex"},
 	{ID: "gpt-5.3-codex-spark", Object: "model", Created: 1735689600, OwnedBy: "openai", Type: "model", DisplayName: "GPT-5.3 Codex Spark"},
 	{ID: "codex-auto-review", Object: "model", Created: 1776902400, OwnedBy: "openai", Type: "model", DisplayName: "Codex Auto Review"},
 	{ID: "gpt-5.2", Object: "model", Created: 1733875200, OwnedBy: "openai", Type: "model", DisplayName: "GPT-5.2"},

frontend/src/components/keys/UseKeyModal.vue

@@ -700,22 +700,6 @@ function generateOpenCodeConfig(platform: string, baseUrl: string, apiKey: strin
         xhigh: {}
       }
     },
-    'gpt-5.3-codex': {
-      name: 'GPT-5.3 Codex',
-      limit: {
-        context: 400000,
-        output: 128000
-      },
-      options: {
-        store: false
-      },
-      variants: {
-        low: {},
-        medium: {},
-        high: {},
-        xhigh: {}
-      }
-    },
     'codex-mini-latest': {
       name: 'Codex Mini',
       limit: {

frontend/src/composables/useModelWhitelist.ts

@@ -12,7 +12,7 @@ const openaiModels = [
   // GPT-5.4 系列
   'gpt-5.4', 'gpt-5.4-mini', 'gpt-5.4-2026-03-05',
   // GPT-5.3 / Codex 系列
-  'gpt-5.3-codex', 'gpt-5.3-codex-spark', 'codex-auto-review',
+  'gpt-5.3-codex-spark', 'codex-auto-review',
   'gpt-4o-audio-preview', 'gpt-4o-realtime-preview',
   // GPT Image 系列
   'gpt-image-1', 'gpt-image-1.5', 'gpt-image-2'