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/lib/tokens.test.ts

@@ -0,0 +1,57 @@
+import { describe, expect, it } from "vitest";
+import { formatTokens, kToTokens, tokenInputError, tokenRangeText, tokensToK } from "./tokens.ts";
+
+describe("token 以 K 为单位的换算", () => {
+  it("原始值 → 输入框 K 值:整千、小数、空", () => {
+    expect(tokensToK(128_000)).toBe("128");
+    expect(tokensToK(1_500)).toBe("1.5");
+    expect(tokensToK(4_096)).toBe("4.096");
+    expect(tokensToK(2_000_000)).toBe("2000");
+    expect(tokensToK(null)).toBe("");
+    expect(tokensToK(undefined)).toBe("");
+  });
+
+  it("K 值 → 原始值:允许小数与尾随 K,空串 undefined,非法 NaN", () => {
+    expect(kToTokens("128")).toBe(128_000);
+    expect(kToTokens(" 1.5 ")).toBe(1_500);
+    expect(kToTokens("200k")).toBe(200_000);
+    expect(kToTokens(".5")).toBe(500);
+    expect(kToTokens("0.0005")).toBe(1);
+    expect(kToTokens("")).toBeUndefined();
+    expect(kToTokens("  ")).toBeUndefined();
+    expect(kToTokens("abc")).toBeNaN();
+    expect(kToTokens("-1")).toBeNaN();
+    expect(kToTokens("1e3")).toBeNaN();
+  });
+
+  it("往返不丢精度", () => {
+    for (const n of [4_000, 4_096, 128_000, 131_072, 1_000_000, 2_000_000, 1]) expect(kToTokens(tokensToK(n))).toBe(n);
+  });
+
+  it("校验:范围、必填、非法输入,错误用 K 表述", () => {
+    const r = { min: 4_000, max: 2_000_000, required: true };
+    expect(tokenRangeText(r)).toBe("4K–2000K");
+    expect(tokenInputError("128", r)).toBeNull();
+    expect(tokenInputError("4", r)).toBeNull();
+    expect(tokenInputError("3.9", r)).toBe("填 4K–2000K");
+    expect(tokenInputError("2001", r)).toBe("填 4K–2000K");
+    expect(tokenInputError("", r)).toBe("填一个数，单位 K");
+    expect(tokenInputError("12x", r)).toMatch(/只填数字/);
+    // 可选:空串通过;0 不行
+    expect(tokenInputError("", { min: 1 })).toBeNull();
+    expect(tokenInputError("0", { min: 1 })).toBe("填 0.001K 以上");
+    expect(tokenInputError("0", {})).toBe("填大于 0 的数");
+  });
+
+  it("列表 / 详情显示:K / M 简写", () => {
+    expect(formatTokens(512)).toBe("512");
+    expect(formatTokens(1_500)).toBe("1.5K");
+    expect(formatTokens(12_345)).toBe("12.3K");
+    expect(formatTokens(128_000)).toBe("128K");
+    expect(formatTokens(200_000)).toBe("200K");
+    expect(formatTokens(999_960)).toBe("1M");
+    expect(formatTokens(1_000_000)).toBe("1M");
+    expect(formatTokens(1_048_576)).toBe("1.05M");
+    expect(formatTokens(undefined)).toBe("—");
+  });
+});