Add login gate, calculation history, and AI markdown download.

Co-authored-by: Cursor <cursoragent@cursor.com>

components/modes/bazi-form.tsx

@@ -16,6 +16,7 @@ import RegionSelect, {
 } from "@/components/shared/region-select";
 import { calculateBazi, type BaziChart } from "@/lib/calc/bazi";
 import { streamAiCompletion } from "@/lib/ai/client-stream";
+import { saveHistoryEntry } from "@/lib/history/storage";
 
 export default function BaziForm() {
   const [date, setDate] = useState(todaySolarYmd());
@@ -80,7 +81,7 @@ export default function BaziForm() {
     setIsLoading(true);
 
     try {
-      await streamAiCompletion(
+      const text = await streamAiCompletion(
         {
           mode: "bazi",
           payload: {
@@ -91,6 +92,18 @@ export default function BaziForm() {
         },
         setCompletion,
       );
+      saveHistoryEntry({
+        mode: "bazi",
+        title: "生辰八字解读",
+        question,
+        summary: activeChart.lunarDate,
+        completion: text,
+        meta: {
+          出生地域: location!.name,
+          阳历生日: `${input.date} ${input.time}`,
+          农历: activeChart.lunarDate,
+        },
+      });
     } catch (err) {
       setError(err instanceof Error ? err.message : String(err));
     } finally {
@@ -98,6 +111,12 @@ export default function BaziForm() {
     }
   }
 
+  const activeChartPreview = chart;
+  const downloadPreamble =
+    completion && location
+      ? `# 生辰八字 AI 解读\n\n- 问事：${question}\n- 出生地域：${location.name}\n- 阳历：${date} ${unknownHour ? "时辰不详" : time}\n${activeChartPreview ? `- 农历：${activeChartPreview.lunarDate}\n` : ""}`
+      : undefined;
+
   return (
     <ModeWorkspace
       aiPanel={
@@ -108,6 +127,8 @@ export default function BaziForm() {
           onCompletion={handleAnalyze}
           error={error}
           emptyHint="排盘后点击「AI 测算」获取解读"
+          downloadFilename={completion ? "生辰八字解读.md" : undefined}
+          downloadPreamble={downloadPreamble}
         />
       }
     >