feat(asset-ai): simplify count answers and refine mobile conversation layout

src/server/routes/asset-assistant/presentation.ts

@@ -1,5 +1,31 @@
 import { CATEGORY_LABELS, GROUP_LABELS, type AssistantResult, type QueryPlan } from "../../../shared/assets/assistant.js";
 
+/** Only simplify verified, single-scope count queries; never infer zero from missing data. */
+export function simplifyCountAnswer(result: AssistantResult, question: string): boolean {
+  const p = result.plan;
+  const metric = result.metrics.find(m => m.label === CATEGORY_LABELS[p.category] && m.unit === "台");
+  if (result.sections?.length || p.kind !== "assets" || p.responseMode ||
+      p.groupBy !== "none" || p.secondaryGroupBy || p.view !== "chart" ||
+      (p.analysis && p.analysis !== "distribution") || p.comparePrevious || p.topN ||
+      result.warning || result.unanswered?.length || result.gap ||
+      !["complete", "empty"].includes(result.outcome || "") ||
+      !metric || !Number.isFinite(metric.value) || metric.value < 0 ||
+      !/(多少|几台|几辆|数量|总数)/.test(question) ||
+      /(分别|各|分布|占比|比例|运营率|对比|比较|趋势|变化|原因|为什么|分析|明细|清单|列表|表格|图表|排行|最多|最少|以及|和|与|、)/.test(question)) return false;
+  const scope = result.scope || resultScope(p, null);
+  const filters = scope.filters.slice(1);
+  result.conciseCount = true;
+  result.summary = `${scope.company}${filters.length ? `，${filters.join("，")}` : ""}，当前${CATEGORY_LABELS[p.category]}为 ${metric.value.toLocaleString()} 台。`;
+  result.metrics = [metric];
+  result.suggestions = [];
+  // A successful zero count is an answer, not a query failure or missing dataset.
+  result.outcome = "complete";
+  delete result.presentation;
+  delete result.presentationStatus;
+  delete result.presentationWarning;
+  return true;
+}
+
 export function resultScope(plan: QueryPlan, subject: string | null): NonNullable<AssistantResult["scope"]> {
   const filters = [
     plan.kind === "flow" ? "交退换车业务" : CATEGORY_LABELS[plan.category],