feat(codex): 拆分openai:compact为独立端点，简化Codex请求为透传模式

- 新增openai:compact端点类型(EndpointKind.COMPACT)，独立于openai:cli
- OpenAICompactAdapter继承OpenAICliAdapter，自动标记compact模式
- Codex请求补丁改为纯透传：仅清理内部标记，不再修改客户端payload
- stream_policy支持openai:compact独立策略，compact端点移除stream字段
- candidate_builder支持compact回退到cli端点
- auth_type: vertex_ai重命名为service_account，保持向后兼容
- Vertex Provider新增api_formats与auth_type组合校验
- KeyAllowedModels对话框改为从Provider获取模型，展示provider_model_name
- Dialog内Select组件自动禁用Portal，修复层级遮挡问题
- 新增Codex compact端点回填迁移脚本

src/api/admin/models/routing.py

@@ -422,6 +422,7 @@ class AdminGetModelRoutingPreviewAdapter(AdminApiAdapter):
             preferred_order = [
                 "openai:chat",
                 "openai:cli",
+                "openai:compact",
                 "openai:video",
                 "claude:chat",
                 "claude:cli",

src/api/admin/system.py

@@ -838,15 +838,20 @@ class AdminGetApiFormatsAdapter(AdminApiAdapter):
         def _label_for(sig: str) -> str:
             fam, kind = (sig.split(":", 1) + [""])[:2]
             fam_title = {"claude": "Claude", "openai": "OpenAI", "gemini": "Gemini"}.get(fam, fam)
-            kind_title = {"chat": "Chat", "cli": "CLI", "video": "Video", "image": "Image"}.get(
-                kind, kind
-            )
+            kind_title = {
+                "chat": "Chat",
+                "cli": "CLI",
+                "compact": "Compact",
+                "video": "Video",
+                "image": "Image",
+            }.get(kind, kind)
             return f"{fam_title} {kind_title}".strip()
 
         endpoint_defs = list_endpoint_definitions()
         preferred_order = [
             "openai:chat",
             "openai:cli",
+            "openai:compact",
             "openai:video",
             "claude:chat",
             "claude:cli",