fix: add GET endpoints for stats summary and logs query

backend/app/routers/stats.py

@@ -1,16 +1,28 @@
 """统计上报路由"""
-from fastapi import APIRouter, Depends, Header, HTTPException
+from datetime import datetime, timedelta
+from typing import Optional
+from fastapi import APIRouter, Depends, Header, HTTPException, Query
 from sqlalchemy.orm import Session
+from sqlalchemy import func
 
 from ..database import get_db
 from ..config import get_settings
 from ..models.stats import AICallEvent
 from ..schemas.stats import AICallEventCreate, AICallEventResponse, BatchReportRequest
+from ..services.auth import decode_token
 
-router = APIRouter(prefix="/api/stats", tags=["stats"])
+router = APIRouter(prefix="/stats", tags=["stats"])
 settings = get_settings()
 
 
+def get_current_user_optional(authorization: Optional[str] = Header(None)):
+    """可选的用户认证"""
+    if authorization and authorization.startswith("Bearer "):
+        token = authorization[7:]
+        return decode_token(token)
+    return None
+
+
 def verify_api_key(x_api_key: str = Header(..., alias="X-API-Key")):
     """验证API Key"""
     if x_api_key != settings.API_KEY:
@@ -43,3 +55,79 @@ async def batch_report_ai_calls(
     db.add_all(events)
     db.commit()
     return {"success": True, "count": len(events)}
+
+
+@router.get("/summary")
+async def get_stats_summary(
+    db: Session = Depends(get_db),
+    user = Depends(get_current_user_optional)
+):
+    """获取统计摘要（用于仪表盘）"""
+    today = datetime.now().date()
+    
+    # 今日调用次数和 token 消耗
+    today_stats = db.query(
+        func.count(AICallEvent.id).label('calls'),
+        func.coalesce(func.sum(AICallEvent.total_tokens), 0).label('tokens')
+    ).filter(
+        func.date(AICallEvent.created_at) == today
+    ).first()
+    
+    # 本周数据
+    week_start = today - timedelta(days=today.weekday())
+    week_stats = db.query(
+        func.count(AICallEvent.id).label('calls'),
+        func.coalesce(func.sum(AICallEvent.total_tokens), 0).label('tokens')
+    ).filter(
+        func.date(AICallEvent.created_at) >= week_start
+    ).first()
+    
+    return {
+        "today_calls": today_stats.calls if today_stats else 0,
+        "today_tokens": int(today_stats.tokens) if today_stats else 0,
+        "week_calls": week_stats.calls if week_stats else 0,
+        "week_tokens": int(week_stats.tokens) if week_stats else 0
+    }
+
+
+@router.get("/trend")
+async def get_stats_trend(
+    days: int = Query(7, ge=1, le=30),
+    tenant_id: Optional[str] = None,
+    db: Session = Depends(get_db),
+    user = Depends(get_current_user_optional)
+):
+    """获取调用趋势数据"""
+    end_date = datetime.now().date()
+    start_date = end_date - timedelta(days=days-1)
+    
+    query = db.query(
+        func.date(AICallEvent.created_at).label('date'),
+        func.count(AICallEvent.id).label('calls'),
+        func.coalesce(func.sum(AICallEvent.total_tokens), 0).label('tokens')
+    ).filter(
+        func.date(AICallEvent.created_at) >= start_date,
+        func.date(AICallEvent.created_at) <= end_date
+    )
+    
+    if tenant_id:
+        query = query.filter(AICallEvent.tenant_id == tenant_id)
+    
+    results = query.group_by(func.date(AICallEvent.created_at)).all()
+    
+    # 转换为字典便于查找
+    data_map = {str(r.date): {"calls": r.calls, "tokens": int(r.tokens)} for r in results}
+    
+    # 填充所有日期
+    trend = []
+    current = start_date
+    while current <= end_date:
+        date_str = str(current)
+        trend.append({
+            "date": date_str,
+            "calls": data_map.get(date_str, {}).get("calls", 0),
+            "tokens": data_map.get(date_str, {}).get("tokens", 0)
+        })
+        current += timedelta(days=1)
+    
+    return {"trend": trend}