feat(flow): 新增分组执行与异步模式支持

refactor(executors): 将 Rhai 引擎评估逻辑迁移至 script_rhai 模块
docs: 添加 Flow 架构文档与示例 JSON
feat(i18n): 新增前端多语言支持
perf(axios): 优化 token 刷新与 401 处理逻辑
style: 统一代码格式化与简化条件判断

scripts/results/code_js1_batch_20251010_235010.json

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+{
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+}

scripts/results/code_js1_batch_20251011_000537.json

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+{
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+  "method": "POST",
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+  "concurrency": 300,
+  "timeout_sec": 8.0,
+  "ok": 5000,
+  "errors": 0,
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+}

scripts/results/code_js1_batch_20251011_001656.json

@@ -0,0 +1,29 @@
+{
+  "url": "http://127.0.0.1:9898/api/dynamic/code_js1",
+  "method": "POST",
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+  "concurrency": 300,
+  "timeout_sec": 8.0,
+  "ok": 5000,
+  "errors": 0,
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+}