feat(provider): support Codex subscriptions with ChatGPT sign-in (#2513)

* feat(provider): support Codex subscriptions with ChatGPT sign-in

* style: format Codex live integration test

* fix(provider): preserve Codex identity in temporary model tests

* fix(web): portal provider selector without dialog overflow

* fix(web): allow native scrolling in provider dropdown

* fix(provider): surface safe Codex quota and upstream errors

* fix(web): provide reliable Codex copy feedback in dialogs

* feat(provider): confirm cascade deletion from edit dialog

* fix(persistence): discard connections after failed commit

* fix(web): polish provider loading and confirmation motion

---------

Co-authored-by: dadachann <185672915+dadachann@users.noreply.github.com>

src/langbot/pkg/provider/modelmgr/requesters/codex.yaml

@@ -0,0 +1,27 @@
+apiVersion: v1
+kind: LLMAPIRequester
+metadata:
+  name: openai-codex
+  label:
+    en_US: OpenAI Codex
+    zh_Hans: OpenAI Codex
+    ja_JP: OpenAI Codex
+  icon: openai.svg
+spec:
+  config:
+  - name: base_url
+    label:
+      en_US: ChatGPT endpoint
+      zh_Hans: ChatGPT 服务地址
+      ja_JP: ChatGPT エンドポイント
+    type: string
+    required: false
+    default: https://chatgpt.com/backend-api/codex
+  alias: "openai codex ChatGPT subscription OAuth 订阅"
+  support_type:
+  - llm
+  provider_category: manufacturer
+execution:
+  python:
+    path: ./codex.py
+    attr: CodexRequester