feat: 扩展 cache creation token 细分统计与 effective_input_tokens 计费逻辑

- 新增 cache_creation_ephemeral_5m/1h_input_tokens 字段，区分不同 TTL 的缓存写入 token
- 引入 effective_input_tokens（扣除 cache read 后的有效输入 token），暴露给 usage 接口
- billing 规则生成器支持 5m/1h ephemeral cache 独立定价与分级计费
- usage_mapper 增加 Claude/Anthropic 格式映射，修复 OpenAI responses 格式字段兼容性
- 迁移逻辑增强：支持 checksum 容错、applied/pending 数量日志、逐步执行信息输出
- executor 抽离 LocalExecutionRequestOutcome 类型，统一 sync/stream 路径返回语义
- provider-transport auth 层新增 complete passthrough headers 构建逻辑
- 前端 usage 类型全面补充 effective_input_tokens、cache_creation_tokens、total_input_context 字段

crates/aether-provider-transport/src/headers.rs

@@ -53,6 +53,29 @@ pub fn should_skip_upstream_passthrough_header(name: &str) -> bool {
     ) || should_skip_request_header(name)
 }
 
+pub(crate) fn should_skip_upstream_complete_passthrough_header(name: &str) -> bool {
+    let lower = name.to_ascii_lowercase();
+    matches!(
+        lower.as_str(),
+        "authorization"
+            | "x-api-key"
+            | "x-goog-api-key"
+            | "host"
+            | "content-length"
+            | "transfer-encoding"
+            | "connection"
+            | "accept-encoding"
+            | "content-encoding"
+            | "x-real-ip"
+            | "x-real-proto"
+            | "x-forwarded-for"
+            | "x-forwarded-proto"
+            | "x-forwarded-scheme"
+            | "x-forwarded-host"
+            | "x-forwarded-port"
+    ) || should_skip_request_header(name)
+}
+
 #[cfg(test)]
 mod tests {
     use super::should_skip_upstream_passthrough_header;