feat(sites): 站点请求失败留样(site_failure_sample,每站最近 5 份)

- 迁移 0077 新表 site_failure_sample:类型(parse_error / challenge)、请求类型、脱敏 URL、状态码、
  关键响应头、错误文案、命中规则、脱敏页面开头(≤ 64 KB);样本几十 KB,不放进每条请求都读的 site.config
- 适配器 onFailureSample 回调接到 runtime.siteAdapter,异步写入并删到最近 5 份,写失败只记日志
- GET /sites/{id}/failure-samples(不带正文)与 /failure-samples/{sampleId}(带正文)

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Cxwgnn2pbzQ7rXv3rq7fei

packages/db/src/types.ts

@@ -255,6 +255,7 @@ export type SiteCircuitState = "closed" | "open" | "half_open";
 export type SiteKind = "pt" | "public_bt" | "rss_feed" | "torznab" | "subtitle";
 export type SiteAccountAuthKind = "cookie" | "passkey" | "api_key" | "password";
 export type SiteAccountStatus = "unknown" | "active" | "invalid" | "expired" | "challenge";
+export type SiteFailureSampleKind = "parse_error" | "challenge";
 export type SiteSnapshotKind = "periodic" | "backfill" | "live_search" | "manual";
 export type SiteSnapshotStatus = "running" | "ok" | "partial" | "failed";
 export type SourceReleaseResolutionStatus = "unresolved" | "resolved" | "ambiguous" | "unidentifiable" | "rejected";
@@ -1491,6 +1492,21 @@ export interface SiteAccountTable {
   ua_pending: string | null;
 }
 
+export interface SiteFailureSampleTable {
+  id: Generated<string>;
+  site_id: string;
+  kind: SiteFailureSampleKind;
+  request_kind: string;
+  url: string;
+  http_status: number | null;
+  headers: Generated<Json>;
+  message: string;
+  rule: string | null;
+  body: string;
+  truncated: Generated<boolean>;
+  created_at: GeneratedTimestamptz;
+}
+
 export interface SiteRequestCountTable {
   site_id: string;
   hour: Timestamptz;
@@ -1825,6 +1841,7 @@ export interface DB {
   settings: SettingsTable;
   site: SiteTable;
   site_account: SiteAccountTable;
+  site_failure_sample: SiteFailureSampleTable;
   site_request_count: SiteRequestCountTable;
   site_snapshot: SiteSnapshotTable;
   site_user_data: SiteUserDataTable;
@@ -2051,6 +2068,9 @@ export type SiteUpdate = Updateable<SiteTable>;
 export type SiteAccountRow = Selectable<SiteAccountTable>;
 export type NewSiteAccount = Insertable<SiteAccountTable>;
 export type SiteAccountUpdate = Updateable<SiteAccountTable>;
+export type SiteFailureSampleRow = Selectable<SiteFailureSampleTable>;
+export type NewSiteFailureSample = Insertable<SiteFailureSampleTable>;
+export type SiteFailureSampleUpdate = Updateable<SiteFailureSampleTable>;
 export type SiteRequestCountRow = Selectable<SiteRequestCountTable>;
 export type NewSiteRequestCount = Insertable<SiteRequestCountTable>;
 export type SiteRequestCountUpdate = Updateable<SiteRequestCountTable>;