feat(backend): 出入库编码搜索双路匹配+建单填快照；finance 趋势/日期区间；partner/product 拼音搜索

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JJ1g8XV1YhhmHRzhwWEW7o

backend/internal/handler/testhelper_test.go

@@ -87,10 +87,20 @@ func setupProtectedRouter(db *gorm.DB) *gin.Engine {
 	// 库存路由
 	inv := api.Group("/inventory")
 	inv.GET("", inventoryH.List)
+	inv.GET("/summary", inventoryH.Summary)
 	inv.GET("/logs", inventoryH.Logs)
 	inv.POST("/checks", inventoryH.CreateCheck)
 	inv.GET("/checks/:id", inventoryH.GetCheck)
 
+	// 财务路由
+	financeH := NewFinanceHandler(db)
+	finance := api.Group("/finance")
+	finance.GET("/records", financeH.ListRecords)
+	finance.POST("/records", financeH.Create)
+	finance.PUT("/records/:id/close", financeH.Close)
+	finance.GET("/summary", financeH.Summary)
+	finance.GET("/trend", financeH.Trend)
+
 	// 许可证路由
 	license := api.Group("/license")
 	license.POST("/activate", licenseH.Activate)