feat: add webhook retry queue

README_zh.md

@@ -122,8 +122,11 @@ http://127.0.0.1:19080
 - `GET /api/manage/cases/summary`
 - `POST /api/manage/cases/{case_id}/handle`
 - `POST /api/manage/webhooks/case-update`
+- `GET /api/manage/webhooks/retries`
+- `POST /api/manage/webhooks/retries/drain`
 
 `/api/manage/webhooks/case-update` 需要请求头 `X-Webhook-Token`，并且请求体里的 `status` 目前固定为 `handled`。
+`/api/manage/webhooks/retries` 用于查看最新重试状态，`/api/manage/webhooks/retries/drain` 用于手动触发一次到期重试补偿。
 
 ## 运行识别计时进程
 
@@ -181,6 +184,9 @@ diagnostics_path = "logs/runtime_diagnostics.jsonl"
 [case_sink]
 path = "logs/cases.jsonl"
 
+[webhook_retry_sink]
+path = "logs/webhook_retry.jsonl"
+
 [webhooks]
 enabled = true
 event_url = "https://example.com/runtime-events"
@@ -188,11 +194,16 @@ case_url = "https://example.com/case-events"
 callback_token = "shared-secret"
 connect_timeout_seconds = 3
 read_timeout_seconds = 5
+retry_backoff_seconds = 30
+retry_batch_limit = 20
+retry_max_attempts = 5
+retry_max_backoff_seconds = 1800
 ```
 
 运行时会额外记录：
 
 - `logs/cases.jsonl`：本地处置单状态变更
+- `logs/webhook_retry.jsonl`：Webhook 重试队列状态快照
 - `logs/webhook_delivery.jsonl`：Webhook 投递结果审计
 
 ## 本地测试