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zhangfei 9c3e603b94 Fix Bug #443 : 手术计费：点击签发耗材时异常报错

当手术计费弹窗中点击"签发"耗材时，因耗材的locationId（发放库房）为空导致后端异常。
在DoctorStationAdviceAppServiceImpl.handDevice方法中，当locationId为null时，使用登录用户的科室ID作为默认值，
与NurseBillingAppService中的处理方式保持一致。

2026-05-08 09:14:18 +08:00

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Web Layer - API Controllers

Module: openhis-application/web Role: API endpoint layer - all REST controllers for frontend communication

OVERVIEW

46 web modules serving REST APIs for all business functionality.

STRUCTURE

web/
├── [module-name]/
│   ├── controller/     # REST endpoints (@RestController)
│   ├── dto/           # Data transfer objects
│   ├── mapper/        # MyBatis mappers (if module-specific)
│   └── appservice/    # Application service layer
│       └── impl/

WHERE TO LOOK

Task	Location
API endpoints	`/controller/Controller.java`
Request/Response schemas	`/dto/.java`
Business logic orchestration	`/appservice/.java`

CONVENTIONS

Controllers: @RestController, @RequestMapping("/module-name")
Standard response: AjaxResult from core-common
DTO naming: XxxRequest, XxxResponse, XxxDTO
Service pattern: interface in appservice/, impl in appservice/impl/
API naming: listXxx(), getXxx(), addXxx(), updateXxx(), deleteXxx()

ANTI-PATTERNS

Never put business logic in controllers - delegate to appservice
Never return raw entities - use DTOs
Never bypass AjaxResult wrapper
Never create module-specific mappers without justification

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