feat: 5个列表API新增搜索参数支持

- visits: search沟通内容/客户需求/拜访人/客户名
- daily_notes: search内容
- work_plans: search计划内容/客户名
- mini_business: search产品/跟进/客户名
- key_visits: search描述/拜访人/客户名

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

backend/app/api/visits.py

@@ -3,7 +3,7 @@ from datetime import date, datetime
 from typing import Optional
 from fastapi import APIRouter, Depends, HTTPException, Query
 from sqlalchemy.ext.asyncio import AsyncSession
-from sqlalchemy import select, func
+from sqlalchemy import select, func, or_
 from app.database import get_db
 from app.middleware.auth import get_current_user, require_any_role
 from app.models.visit import Visit
@@ -63,6 +63,7 @@ async def list_visits(
     date_to: Optional[str] = Query(None),
     customer_id: Optional[str] = Query(None),
     customer_type: Optional[str] = Query(None),
+    search: Optional[str] = Query(None),
     current_user: dict = Depends(get_current_user),
     db: AsyncSession = Depends(get_db),
 ):
@@ -80,6 +81,10 @@ async def list_visits(
         query = query.where(Visit.customer_id == uuid.UUID(customer_id))
     if customer_type:
         query = query.join(Customer, Visit.customer_id == Customer.id).where(Customer.customer_type == customer_type)
+    if search:
+        query = query.outerjoin(Customer, Visit.customer_id == Customer.id).where(
+            or_(Visit.communication_content.ilike(f"%{search}%"), Visit.customer_demand.ilike(f"%{search}%"), Visit.visitor_name.ilike(f"%{search}%"), Customer.name.ilike(f"%{search}%"))
+        )
 
     query = query.order_by(Visit.visit_date.desc(), Visit.created_at.desc()).limit(200)
     result = await db.execute(query)