Treat audio validation failures as non-retryable input errors (#58434)

## What changed

Map audio size, data, format, and sample-rate validation failures to `InvalidAudioInput` for HTTP 400 responses and streamed errors. Preserve the provider's message, falling back to `Invalid audio input.` when it is absent or blank.

Classify these errors as non-retryable and expose them as `BadRequest`. Redact their messages in doctor diagnostics and group them as invalid requests in telemetry.

## Testing

Add coverage for all six audio validation codes across HTTP errors, streamed `error` events, and `response.failed` events, checking error classification, message preservation, and the absence of retries. Extend doctor diagnostic redaction coverage for `InvalidAudioInput`.

GitOrigin-RevId: 0a59964bcabd83997bdb32fc9318a5482dac33b0

codex-rs/response-debug-context/src/lib.rs

@@ -86,9 +86,9 @@ pub fn telemetry_api_error_message(error: &ApiError) -> String {
         ApiError::RateLimitExceeded { .. } => "rate limit exceeded".to_string(),
         ApiError::RateLimit(_) => "rate limit".to_string(),
         ApiError::ModelNotFound { .. } => "model not found".to_string(),
-        ApiError::InvalidRequest { .. } | ApiError::InvalidPrompt { .. } => {
-            "invalid request".to_string()
-        }
+        ApiError::InvalidRequest { .. }
+        | ApiError::InvalidAudioInput { .. }
+        | ApiError::InvalidPrompt { .. } => "invalid request".to_string(),
         ApiError::CyberPolicy { .. } => "cyber policy".to_string(),
         ApiError::BioPolicy { .. } => "bio policy".to_string(),
         ApiError::MisalignmentPolicyViolation { .. } => "misalignment policy violation".to_string(),