feat(config): 统一加载 .env 并强化本地启动脚本

backend/cmd/reseed-logical-model-sources/main.go

@@ -9,6 +9,7 @@ import (
 	"sort"
 	"strings"
 
+	"infinite-canvas/backend/internal/config"
 	"infinite-canvas/backend/internal/database"
 	"infinite-canvas/backend/internal/model"
 	"infinite-canvas/backend/internal/repository"
@@ -25,6 +26,7 @@ type sourcePlan struct {
 }
 
 func main() {
+	config.LoadDotEnv()
 	apply := flag.Bool("apply", false, "将符合条件的前台模型改为系统渠道模型驱动")
 	flag.Parse()