新增持仓分析 prompt 生成功能

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ft-app/app/routers/contracts.py

@@ -1,10 +1,11 @@
 import math
 from datetime import date, timedelta
 from fastapi import APIRouter, Depends, Request, Query
-from fastapi.responses import HTMLResponse
+from fastapi.responses import HTMLResponse, PlainTextResponse
 from sqlalchemy.orm import Session
 from app.database import get_db
 from app.models import DailyBar, Contract, PositionRanking
+from app.prompt_builder import build_prompt
 
 router = APIRouter(prefix="/contracts", tags=["contracts"])
 
@@ -205,3 +206,9 @@ def contract_detail(
             WEEKDAY_ZH=WEEKDAY_ZH,
         )
     )
+
+
+@router.get("/{contract}/analysis-prompt", response_class=PlainTextResponse)
+def contract_analysis_prompt(contract: str):
+    """返回合约的持仓分析 prompt 文本。"""
+    return build_prompt(contract.upper())