feat(settings): storage budgets and retention in settings UI, tmdbMaxSize default 5000 (INT-3)

- Automation section gets storage budget, retention and cache TTL cards bound to settings.storage
- Metadata section drops deprecated cache.tmdbTtlHours / cache.emptyResultTtlSec / identity.poolArchiveDays inputs
- cache.tmdbMaxSize default 256 -> 5000; migration 0051 bumps stored values still at the old default

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/web/app/components/settings/metadata.tsx

@@ -102,27 +102,15 @@ function TmdbKeyStatus({ saved }: { saved: boolean }) {
 const TMDB_CACHE_CARD: CardSpec = {
   anchor: "tmdb-cache",
   title: "TMDB 缓存",
-  description: "请求响应与识别结果存在数据库里，三个进程共用。超过条数上限时删最久未用的条目。",
-  fields: [
-    { name: "cache.tmdbTtlHours", label: "有效期（小时）", kind: "number" },
-    { name: "cache.tmdbMaxSize", label: "条数上限", kind: "number", hint: "请求缓存和识别缓存各自计数" },
-    {
-      name: "cache.emptyResultTtlSec",
-      label: "空结果有效期（秒）",
-      kind: "number",
-      hint: "搜索无结果、未识别时的短缓存",
-    },
-  ],
+  description:
+    "请求响应与识别结果存在数据库里，三个进程共用。超过条数上限时删最久未用的条目；有效期在「自动化 → 存储与保留」里设。",
+  fields: [{ name: "cache.tmdbMaxSize", label: "条数上限", kind: "number", hint: "请求缓存和识别缓存各自计数" }],
   fromSettings: (s) => ({
-    "cache.tmdbTtlHours": n(s.cache.tmdbTtlHours),
     "cache.tmdbMaxSize": n(s.cache.tmdbMaxSize),
-    "cache.emptyResultTtlSec": n(s.cache.emptyResultTtlSec),
   }),
   toPatch: (v) => ({
     cache: {
-      tmdbTtlHours: Number(v["cache.tmdbTtlHours"]),
       tmdbMaxSize: Number(v["cache.tmdbMaxSize"]),
-      emptyResultTtlSec: Number(v["cache.emptyResultTtlSec"]),
     },
   }),
   extra: () => <TmdbCacheStatus />,
@@ -224,12 +212,6 @@ const IDENTITY_CARD: CardSpec = {
       hint: "旧行为。每条资源约 1–2 次搜索 + 命中时 1 次详情（识别缓存命中为 0）；每小时 100 条的 RSS 约每天 2400–7200 次请求，站点独有的短剧 / 综艺多半查不到",
       wide: true,
     },
-    {
-      name: "identity.poolArchiveDays",
-      label: "待识别池归档（天）",
-      kind: "number",
-      hint: "未命中订阅的条目超过这么多天没有新证据就归档，仍可筛出并手动指定",
-    },
     {
       name: "identity.autoEnrich",
       label: "TMDB 查不到时自动补全元数据",
@@ -253,7 +235,6 @@ const IDENTITY_CARD: CardSpec = {
   ],
   fromSettings: (s) => ({
     "identity.eagerTmdbLookup": s.identity.eagerTmdbLookup,
-    "identity.poolArchiveDays": n(s.identity.poolArchiveDays),
     "identity.autoEnrich": s.identity.autoEnrich,
     "identity.enrichDailyBudget": n(s.identity.enrichDailyBudget),
     "identity.enrichDomains": s.identity.enrichDomains.join("\n"),
@@ -261,7 +242,6 @@ const IDENTITY_CARD: CardSpec = {
   toPatch: (v) => ({
     identity: {
       eagerTmdbLookup: v["identity.eagerTmdbLookup"] === true,
-      poolArchiveDays: Number(v["identity.poolArchiveDays"]),
       autoEnrich: v["identity.autoEnrich"] === true,
       enrichDailyBudget: Number(v["identity.enrichDailyBudget"]),
       enrichDomains: String(v["identity.enrichDomains"] ?? "")