初始化提交：go比特版本精简

tests/hardcoded_browser_proxy_pool.test.js

@@ -0,0 +1,21 @@
+'use strict';
+
+const assert = require('assert');
+const {
+  HARDCODED_BROWSER_PROXIES,
+  pickRandomBrowserProxy,
+} = require('../src/services/hardcoded_browser_proxy_pool');
+
+assert.strictEqual(HARDCODED_BROWSER_PROXIES.length, 50, '固定代理池应完整包含 50 条代理');
+assert.strictEqual(new Set(HARDCODED_BROWSER_PROXIES).size, 50, '固定代理池不应包含重复代理');
+assert.ok(
+  HARDCODED_BROWSER_PROXIES.every(proxy => /^\d{1,3}(?:\.\d{1,3}){3}:\d+:[^:]+:[^:]+$/.test(proxy)),
+  '所有代理都应使用 host:port:user:password 格式',
+);
+
+assert.strictEqual(pickRandomBrowserProxy(() => 0), HARDCODED_BROWSER_PROXIES[0]);
+assert.strictEqual(pickRandomBrowserProxy(() => 0.999999), HARDCODED_BROWSER_PROXIES[49]);
+assert.strictEqual(pickRandomBrowserProxy(() => 1), HARDCODED_BROWSER_PROXIES[49]);
+assert.strictEqual(pickRandomBrowserProxy(() => Number.NaN), HARDCODED_BROWSER_PROXIES[0]);
+
+console.log('hardcoded_browser_proxy_pool.test.js: PASS');