feat(qs): 汽水音乐平台接入——匿名搜索/试听、抖音扫码登录、解密流代理

- sdk/qs 平台模块(安卓参数指纹匿名搜索)+ sdk/apis/qs 取流:
  匿名 30s 试听,登录态走签名 track_v2 + spade key AES-CTR 解密
- /login/qs/qr 抖音扫码登录(授权后 sessionid 解锁完整曲目)
- /stream/qs/:id 解密流代理,/url 返回的相对地址按请求 host 补全
- 回归测试覆盖 kw 双通道(VIP 真音频/降级链)与 qs 试听;start.bat 去掉
  SOURCE_ENABLED 直启

sdk/qs/crypto/ladon.ts

@@ -0,0 +1,18 @@
+import { b64encode, getCrypto } from "./index.ts";
+import { generateLadonKey, speckEncrypt } from "./speck.ts";
+import type { UnidbgConfig } from "./unidbgconfig.ts";
+
+export async function getLadon(timestamp: number, config: UnidbgConfig): Promise<string> {
+    const randomBytes = getCrypto().getRandomValues(new Uint8Array(4));
+
+    const plaintext = new TextEncoder().encode(
+        `${timestamp}-${config.licenseId}-${config.aid}`,
+    );
+    const key = await generateLadonKey(randomBytes, config.aid);
+    const encrypted = speckEncrypt(key, plaintext);
+
+    const result = new Uint8Array(randomBytes.length + encrypted.length);
+    result.set(randomBytes);
+    result.set(encrypted, randomBytes.length);
+    return b64encode(result.buffer);
+}