PlantAI-rag-new 首次提交：文献知识工作台

- BFF 薄适配层（FastAPI，8090）：QA 代理/SSE 中继/Neo4j 直连/抽取代理/会话持久化 - Vue3 前端：五相位检索流水线、文献来源与证据链、知识图谱、提取任务四 tab - 四档响应式（桌面/笔记本/平板/手机）、深浅主题 - 81 个 FR 全部实现，测试追溯矩阵 81/81，后端 121 测/前端 156 测 - 真实凭据已脱敏，运行时配置在 backend/.env（不入 git） Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-08-25 20:47:52 +08:00
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+// deploy/m2_probe3.js —— 浏览器 fetch chunk 级探针（PM 使用，在远端运行）
+// 目的：确定 progress 帧丢失发生在哪一层（Vite proxy 缓冲？fetch 读取？parser？）
+const { chromium } = require('playwright');
+
+(async () => {
+  const browser = await chromium.launch();
+  const ctx = await browser.newContext({ viewport: { width: 1440, height: 900 } });
+  const page = await ctx.newPage();
+
+  // 在页面上下文里直接发起 fetch 并记录 chunk 到达时间线与内容
+  const result = await page.evaluate(async () => {
+    const t0 = Date.now();
+    const log = [];
+    const ctrl = new AbortController();
+    const timeout = setTimeout(() => ctrl.abort(), 90000);
+    try {
+      const resp = await fetch('http://127.0.0.1:5180/api/qa/chat/stream', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({
+          question: 'SPL gene family in rice',
+          use_llm: true, debug: false,
+          chain_top_k: 3, chain_hops: 2, chain_max_edges: 12, chain_max_nodes: 10,
+          native_chain_enabled: true, native_chain_max_hops: 3, native_chain_top_k: 5,
+        }),
+        signal: ctrl.signal,
+      });
+      log.push(`T+${Math.round((Date.now() - t0) / 1000)}s headers: status=${resp.status} ct=${resp.headers.get('content-type')}`);
+      const reader = resp.body.getReader();
+      const decoder = new TextDecoder();
+      let nChunks = 0;
+      for (;;) {
+        const { done, value } = await reader.read();
+        if (done) break;
+        nChunks++;
+        const text = decoder.decode(value, { stream: true });
+        const events = (text.match(/event: \w+/g) || []).join(',');
+        log.push(`T+${Math.round((Date.now() - t0) / 1000)}s chunk#${nChunks} len=${value.length} [${events}] preview=${text.slice(0, 80).replace(/\n/g, '↵')}`);
+      }
+      log.push(`T+${Math.round((Date.now() - t0) / 1000)}s stream done, ${nChunks} chunks total`);
+    } catch (e) {
+      log.push(`ERROR: ${e.name}: ${e.message}`);
+    }
+    clearTimeout(timeout);
+    return log;
+  });
+
+  result.forEach((l) => console.log(l));
+  await browser.close();
+})();