fix(planting-service): 修复合同签署功能编译错误

- 修复 JwtAuthGuard 导入路径
- 添加 @nestjs/schedule 依赖

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/services/planting-service/package.json

@@ -31,6 +31,7 @@
     "@nestjs/platform-express": "^10.0.0",
     "@nestjs/swagger": "^7.1.17",
     "@nestjs/axios": "^3.0.1",
+    "@nestjs/schedule": "^4.0.0",
     "@nestjs/jwt": "^10.2.0",
     "@nestjs/passport": "^10.0.3",
     "@prisma/client": "^5.7.0",

backend/services/planting-service/src/api/controllers/contract-signing.controller.ts

@@ -10,7 +10,7 @@ import {
   HttpStatus,
   Logger,
 } from '@nestjs/common';
-import { JwtAuthGuard } from '../../infrastructure/auth/jwt-auth.guard';
+import { JwtAuthGuard } from '../guards/jwt-auth.guard';
 import { ContractSigningService } from '../../application/services/contract-signing.service';
 
 /**