fix(dashboard): 抽取 report-json 前剥离 <think> 思考过程做容错

推理模型(DeepSeek-R1/QwQ 等)输出的 <think>...</think> 思考里常含
```json/裸 {…}，会被误当候选导致抽到错误/残缺数据。抽取前先剥离 think：
- 前端 report-template.ts::extractReportData 开头 stripReasoning(复用 reasoning.ts，
  兼容完整/多段/流式未闭合/只吐闭合四形态)
- 后端 report_json.py 新增 _strip_reasoning 在 extract_report_json 开头调用
- report-template.test.ts +3 例(均通过)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend-web/src/roundtable-planning/lib/report-template.test.ts

@@ -67,6 +67,32 @@ test("extractReportData：dependsOn 只保留真实存在的席位 id（剔除
   assert.deepEqual(d.seats[0].dependsOn, ["s2"]);
 });
 
+test("extractReportData：剥离 <think> 思考过程后再抽取（思考里的假 JSON 不干扰）", () => {
+  // 思考块里故意混入一个会「像」契约但不该被采用的裸 JSON，正文才是真数据。
+  const withThink = [
+    "<think>",
+    '我先草拟一版：{"title":"草稿不要用","seats":[{"id":"x","name":"废弃"}]}',
+    "再想想……",
+    "</think>",
+    SAMPLE,
+  ].join("\n");
+  const d = extractReportData(withThink)!;
+  assert.equal(d.title, "智能机房选址方案大屏");
+  assert.equal(d.seats.length, 2);
+});
+
+test("extractReportData：只吐闭合 </think>（chat template 注入式）也能抽到正文", () => {
+  const onlyClose = ["模型在此思考成本与风险……", "</think>", SAMPLE].join("\n");
+  const d = extractReportData(onlyClose)!;
+  assert.equal(d.title, "智能机房选址方案大屏");
+});
+
+test("extractReportData：流式未闭合 <think> 尾段不被误抽（返回 null）", () => {
+  // 正文还没出，模型还在思考里写了半个 JSON —— 不应抽出数据。
+  const streaming = '正文前导\n<think>我打算输出 {"title":"在想","seats":[{"id":"a","name":"甲"';
+  assert.equal(extractReportData(streaming), null);
+});
+
 test("extractReportData：无 fence / 坏 JSON / 空数据返回 null", () => {
   assert.equal(extractReportData("没有数据块"), null);
   assert.equal(extractReportData("```report-json\n{broken\n```"), null);

frontend-web/src/roundtable-planning/lib/report-template.ts

@@ -34,6 +34,7 @@
  */
 
 import darkBgSvgRaw from "@/assets/img/layout-bg-theme-dark-blue.svg?raw";
+import { stripReasoning } from "@/roundtable-planning/lib/reasoning";
 
 // ── 契约类型 ─────────────────────────────────────────────────────────────────
 
@@ -207,18 +208,23 @@ function arr(v: unknown): unknown[] {
  */
 export function extractReportData(text: string | null | undefined): ReportData | null {
   if (!text) return null;
+  // 容错：先剥离模型 `<think>...</think>` 思考过程（兼容完整/多段/流式未闭合/只吐闭合等
+  // 形态，见 reasoning.ts）。否则思考里出现的 ```json / 裸 {…} 会被误当候选，抽到错误或
+  // 残缺数据（与「抽取结构化流程」同款容错）。无 think 标记时原样返回，仅去首尾空白。
+  const cleaned = stripReasoning(text);
+  if (!cleaned) return null;
   const candidates: string[] = [];
   const rank = (lang: string) =>
     lang === "report-json" ? 0 : lang === "json" || lang === "jsonc" ? 1 : lang === "" ? 2 : 3;
-  collectFencedBlocks(text)
+  collectFencedBlocks(cleaned)
     .map((b, i) => ({ b, i }))
     .sort((x, y) => rank(x.b.lang) - rank(y.b.lang) || y.i - x.i)
     .forEach(({ b }) => candidates.push(b.body));
   // 未闭合围栏（流式截断）：取 report-json fence 之后到结尾。
-  const f = text.lastIndexOf(FENCE);
-  if (f >= 0) candidates.push(text.slice(f + FENCE.length).trim());
+  const f = cleaned.lastIndexOf(FENCE);
+  if (f >= 0) candidates.push(cleaned.slice(f + FENCE.length).trim());
   // 裸 JSON（无围栏 / 夹在文字里）：所有顶层平衡 {…} 对象，靠后的先试，契约形状的优先。
-  const objs = balancedJsonObjects(text);
+  const objs = balancedJsonObjects(cleaned);
   for (const o of objs.filter(looksLikeReportJson).reverse()) candidates.push(o);
   for (const o of objs.reverse()) candidates.push(o);