fix(usage): 修复缓存创建 token 展示并在总量中计入缓存组件

- gateway/admin 用量载荷在 cache_creation_input_tokens 为 0 时回填 ephemeral_5m/1h 合计
- 标准化用量写入时将 cache_creation/cache_read token 计入 total_tokens
- 前端列表与轮询同步新增分类字段，修复缓存 token 列显示

frontend/src/features/usage/token-normalization.ts

@@ -1,6 +1,9 @@
 type UsageTokenLike = {
   effective_input_tokens?: number | null
   input_tokens?: number | null
+  cache_creation_input_tokens?: number | null
+  cache_creation_ephemeral_5m_input_tokens?: number | null
+  cache_creation_ephemeral_1h_input_tokens?: number | null
   cache_read_input_tokens?: number | null
   api_format?: string | null
   endpoint_api_format?: string | null
@@ -17,6 +20,16 @@ function apiFamily(apiFormat: string | null | undefined): string {
     .toLowerCase()
 }
 
+export function getCacheCreationTokens(usage: UsageTokenLike): number {
+  const explicit = toNonNegativeNumber(usage.cache_creation_input_tokens)
+  const classified = toNonNegativeNumber(usage.cache_creation_ephemeral_5m_input_tokens)
+    + toNonNegativeNumber(usage.cache_creation_ephemeral_1h_input_tokens)
+  if (explicit === 0 && classified > 0) {
+    return classified
+  }
+  return explicit
+}
+
 export function getEffectiveInputTokens(usage: UsageTokenLike): number {
   const explicit = toNonNegativeNumber(usage.effective_input_tokens)
   if (explicit > 0) {