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3d18b1a34d
test(P0-5): 补齐 health handler 和 ticket stats handler 测试
新增 internal/http/handlers/health_handler_test.go:
- TestHealthHandler_Live_ReturnsUPWhenLive
- TestHealthHandler_Live_ReturnsDOWNWhenNotLive
- TestHealthHandler_Live_WithNilProbe
- TestHealthHandler_Ready_WithFailingChecker
- TestHealthHandler_Ready_WithPassingChecker
- TestHealthHandler_Health_ReturnsOK
- TestTicketStatsHandler_Get_Success
- TestTicketStatsHandler_Get_Error
- TestTicketStatsHandler_Get_NilAudit
**覆盖率提升**:
- internal/http/handlers: 78.4% → **84.4%** (+6.0%)
- 整体覆盖率: 74.8% → **76.3%** (+1.5%)
所有 P0 任务完成！Phase 2 测试补齐全部达成 🎉
Ref: test/PHASE2_TEST_PLAN.md P0-5