feat: 添加 Codex 模型 provider 完整实现

- 新增 codex API 客户端、流适配、消息/工具转换、模型映射
- 支持 CODEX_API_KEY 和 CODEX_ACCESS_TOKEN 双认证 fallback
- 集成到 claude.ts 调度链和 Langfuse 可观测性
- 包含模型映射单元测试（16 cases）

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

packages/@ant/model-provider/src/providers/codex/callIds.ts

@@ -0,0 +1,31 @@
+import { createHash } from 'crypto'
+
+const MAX_CODEX_CALL_ID_LENGTH = 96
+
+export function normalizeCodexCallId(value: unknown): string | null {
+  if (typeof value !== 'string') {
+    return null
+  }
+
+  const sanitized = value
+    .trim()
+    .replace(/\s+/g, '_')
+    .replace(/[^A-Za-z0-9._:-]/g, '_')
+    .replace(/_+/g, '_')
+    .slice(0, MAX_CODEX_CALL_ID_LENGTH)
+
+  return sanitized.length > 0 ? sanitized : null
+}
+
+export function createCodexFallbackCallId(seed: string): string {
+  const hash = createHash('sha1')
+    .update(seed.length > 0 ? seed : 'codex-call')
+    .digest('hex')
+    .slice(0, 24)
+
+  return `call_${hash}`
+}
+
+export function resolveCodexCallId(value: unknown, seed: string): string {
+  return normalizeCodexCallId(value) ?? createCodexFallbackCallId(seed)
+}