Add audio file references with explicit runtime rejection (#58430)

## What changed

- Allow audio inputs to carry uploaded file references via `fileId` in the app-server API and `file_id` in model content, preserving existing inline audio shapes and Python class names.
- Preserve mixed inline and file-backed audio ordering through history reconstruction and migration, and budget file-backed audio conservatively when duration is unknown.
- Keep uploaded audio disabled at runtime: reject it before inference or raw history injection, preserve accompanying text, and prevent rejected attachments from reaching follow-up or resumed requests.

## Testing

Add coverage for wire-format round trips, SDK compatibility, mixed audio history ordering, and rejection during turn start, steering, task completion, and raw injection.

GitOrigin-RevId: 70895c47a2494c0c9936348ad1250eb1b7b892a6

sdk/python/src/openai_codex/generated/v2_all.py

@@ -1101,8 +1101,16 @@ class InputAudioContentItem(BaseModel):
     model_config = ConfigDict(
         populate_by_name=True,
     )
-    audio_url: str
     type: Annotated[Literal["input_audio"], Field(title="InputAudioContentItemType")]
+    audio_url: str
+
+
+class FileIdContentItem1(BaseModel):
+    model_config = ConfigDict(
+        populate_by_name=True,
+    )
+    type: Annotated[Literal["input_audio"], Field(title="InputAudioContentItemType")]
+    file_id: str
 
 
 class OutputTextContentItem(BaseModel):
@@ -6762,6 +6770,14 @@ class AudioUserInput(BaseModel):
     url: str
 
 
+class FileIdUserInput1(BaseModel):
+    model_config = ConfigDict(
+        populate_by_name=True,
+    )
+    type: Annotated[Literal["audio"], Field(title="AudioUserInputType")]
+    file_id: Annotated[str, Field(alias="fileId")]
+
+
 class LocalAudioUserInput(BaseModel):
     model_config = ConfigDict(
         populate_by_name=True,
@@ -6795,6 +6811,7 @@ class UserInput(
         | FileIdUserInput
         | LocalImageUserInput
         | AudioUserInput
+        | FileIdUserInput1
         | LocalAudioUserInput
         | SkillUserInput
         | MentionUserInput
@@ -6806,6 +6823,7 @@ class UserInput(
         | FileIdUserInput
         | LocalImageUserInput
         | AudioUserInput
+        | FileIdUserInput1
         | LocalAudioUserInput
         | SkillUserInput
         | MentionUserInput
@@ -8375,6 +8393,7 @@ class ContentItem(
         | InputImageContentItem
         | FileIdContentItem
         | InputAudioContentItem
+        | FileIdContentItem1
         | OutputTextContentItem
     ]
 ):
@@ -8383,6 +8402,7 @@ class ContentItem(
         | InputImageContentItem
         | FileIdContentItem
         | InputAudioContentItem
+        | FileIdContentItem1
         | OutputTextContentItem
     )