feat: AI分析页支持按日期查看历史报告（?date=，兼容?data=）

backend/routes/ai_analysis.py

@@ -77,6 +77,29 @@ async def list_reports():
         conn.close()
 
 
+@router.get("/ai-analysis/by-date/{trade_date}", summary="按交易日获取 AI 分析报告")
+async def get_report_by_date(trade_date: str):
+    try:
+        datetime.strptime(trade_date, "%Y-%m-%d")
+    except ValueError:
+        raise HTTPException(status_code=400, detail="日期格式错误，应为 YYYY-MM-DD")
+    conn = get_connection()
+    try:
+        row = conn.execute(
+            """SELECT r.*,
+                      (SELECT COUNT(*) FROM ai_reports WHERE trade_date <= r.trade_date) AS issue_number
+               FROM ai_reports r WHERE r.trade_date = ? AND r.report_type = 'daily' LIMIT 1""",
+            (trade_date,)
+        ).fetchone()
+        if not row:
+            raise HTTPException(status_code=404, detail=f"{trade_date} 暂无分析报告")
+        item = dict_from_row(row)
+        item["toolsUsed"] = json.loads(item.pop("tools_used") or "[]")
+        return JSONResponse({"data": item}, headers=_NO_CACHE_HEADERS)
+    finally:
+        conn.close()
+
+
 @router.get("/ai-analysis/{report_id}", summary="AI 分析报告详情")
 async def get_report(report_id: int):
     conn = get_connection()