feat(web): token 数以 K 输入显示,已存凭证显示掩码占位(FIX-8)

- 新增 UnitInput 与 kind=tokens:上下文预算、单次 token 上限、自定义模型上下文窗口以 K 输入(允许小数),存储仍为原始 token 数;校验与提示用 K 表述;列表/详情 token 数统一 K/M 简写(formatTokens)
- 新增 SecretInput 与 kind=secret:已保存时显示「已设置 ••••••••」(有服务端掩码时带末 4 位),聚焦直接输入替换,留空保持,「清除」确认后保存生效;替换模型服务、TMDB、网页搜索、下载器、媒体服务器、浏览器服务、站点账号、Passkey、本机 Token 各处
- 统一只写凭证服务端语义:省略或空串 = 不变,null = 清除(contracts secretInput);下载器/媒体服务器新增清除;站点凭证同类更新可留空保持密码/Cookie/API Key/TOTP,TOTP 可 null 清除,不再误删 TOTP 与 UA
- contextBudget 最小值 4096→4000、contextWindow 1024→1000,便于按 K 填写
- 测试:换算与校验、SecretInput 渲染与状态、各接口留空不变/显式清除

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

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

@@ -1,3 +1,4 @@
+import { kToTokens, tokensToK } from "~/lib/tokens.ts";
 import { AgentToolsBlock } from "./agent-tools.tsx";
 import { WEBSEARCH_CARD } from "./agent-websearch.tsx";
 import { PiUpstreamsBlock } from "./pi-upstreams.tsx";
@@ -16,9 +17,10 @@ const RUNTIME_CARD: CardSpec = {
   fields: [
     {
       name: "pi.contextBudget",
-      label: "上下文预算(token)",
-      kind: "number",
-      hint: "4096–2000000，超过模型窗口时按窗口算",
+      label: "上下文预算",
+      kind: "tokens",
+      tokens: { min: 4000, max: 2_000_000, required: true },
+      hint: "4K–2000K，超过模型窗口时按窗口算",
     },
     { name: "pi.subagentsEnabled", label: "允许子会话", kind: "switch" },
     { name: "pi.compaction.enabled", label: "上下文压缩", kind: "switch" },
@@ -31,14 +33,14 @@ const RUNTIME_CARD: CardSpec = {
     },
   ],
   fromSettings: (s) => ({
-    "pi.contextBudget": n(s.pi.contextBudget),
+    "pi.contextBudget": tokensToK(s.pi.contextBudget),
     "pi.subagentsEnabled": s.pi.subagentsEnabled,
     "pi.compaction.enabled": s.pi.compaction.enabled,
     "pi.compaction.thresholdRatio": n(s.pi.compaction.thresholdRatio),
   }),
   toPatch: (v) => ({
     pi: {
-      contextBudget: num(v["pi.contextBudget"]),
+      contextBudget: kToTokens(str(v["pi.contextBudget"])),
       subagentsEnabled: v["pi.subagentsEnabled"] === true,
       compaction: {
         enabled: v["pi.compaction.enabled"] === true,
@@ -57,7 +59,13 @@ const BUDGET_CARD: CardSpec = {
     { name: "budget.agentMaxCostUsdPerDay", label: "每日费用(USD)", kind: "number" },
     { name: "agent.maxToolCalls", label: "单次工具调用上限", kind: "number", hint: "1–500" },
     { name: "agent.maxDurationSec", label: "单次时长上限（秒）", kind: "number" },
-    { name: "agent.maxTokensPerRun", label: "单次 token 上限", kind: "number", hint: "留空不限" },
+    {
+      name: "agent.maxTokensPerRun",
+      label: "单次 token 上限",
+      kind: "tokens",
+      tokens: { min: 1 },
+      hint: "单位 K，留空不限",
+    },
     { name: "agent.maxCostUsdPerRun", label: "单次费用上限(USD)", kind: "number", hint: "留空不限" },
   ],
   fromSettings: (s) => ({
@@ -65,7 +73,7 @@ const BUDGET_CARD: CardSpec = {
     "budget.agentMaxCostUsdPerDay": n(s.budget.agentMaxCostUsdPerDay),
     "agent.maxToolCalls": n(s.agent.maxToolCalls),
     "agent.maxDurationSec": n(s.agent.maxDurationSec),
-    "agent.maxTokensPerRun": n(s.agent.maxTokensPerRun),
+    "agent.maxTokensPerRun": tokensToK(s.agent.maxTokensPerRun),
     "agent.maxCostUsdPerRun": n(s.agent.maxCostUsdPerRun),
   }),
   toPatch: (v) => ({
@@ -76,7 +84,7 @@ const BUDGET_CARD: CardSpec = {
     agent: {
       maxToolCalls: num(v["agent.maxToolCalls"]),
       maxDurationSec: num(v["agent.maxDurationSec"]),
-      maxTokensPerRun: nullNum(v["agent.maxTokensPerRun"]),
+      maxTokensPerRun: kToTokens(str(v["agent.maxTokensPerRun"])) ?? null,
       maxCostUsdPerRun: nullNum(v["agent.maxCostUsdPerRun"]),
     },
   }),