feat(config): 统一加载 .env 并强化本地启动脚本

backend/cmd/migrate-channel-model-price-tiers/main.go

@@ -12,6 +12,7 @@ import (
 	"strings"
 	"time"
 
+	"infinite-canvas/backend/internal/config"
 	"infinite-canvas/backend/internal/database"
 	"infinite-canvas/backend/internal/model"
 	"infinite-canvas/backend/internal/repository"
@@ -38,6 +39,7 @@ type familyPlan struct {
 }
 
 func main() {
+	config.LoadDotEnv()
 	apply := flag.Bool("apply", false, "创建系统模型价格档并切换当前前台目录版本")
 	flag.Parse()
 	db, err := database.Open(database.Config{Driver: "postgres", DSN: os.Getenv("DATABASE_URL"), DataDir: os.Getenv("CANVAS_BACKEND_DATA_DIR")})

backend/cmd/migrate-logical-model-families/main.go

@@ -12,6 +12,7 @@ import (
 	"strconv"
 	"strings"
 
+	"infinite-canvas/backend/internal/config"
 	"infinite-canvas/backend/internal/database"
 	"infinite-canvas/backend/internal/model"
 	"infinite-canvas/backend/internal/repository"
@@ -55,6 +56,7 @@ var familyDefinitions = []familyDefinition{
 }
 
 func main() {
+	config.LoadDotEnv()
 	apply := flag.Bool("apply", false, "写入模型家族并归档旧 SKU 目录项")
 	flag.Parse()
 

backend/cmd/migrate-schema/main.go

@@ -8,10 +8,12 @@ import (
 	"strings"
 
 	"infinite-canvas/backend/internal/canvas"
+	"infinite-canvas/backend/internal/config"
 	"infinite-canvas/backend/internal/database"
 )
 
 func main() {
+	config.LoadDotEnv()
 	command := "up"
 	if len(os.Args) > 1 {
 		command = strings.ToLower(strings.TrimSpace(os.Args[1]))

backend/cmd/migrate-sqlite-postgres/main.go

@@ -9,6 +9,7 @@ import (
 	"strings"
 	"time"
 
+	"infinite-canvas/backend/internal/config"
 	"infinite-canvas/backend/internal/database"
 	"infinite-canvas/backend/internal/model"
 
@@ -22,6 +23,7 @@ type tableMigration struct {
 }
 
 func main() {
+	config.LoadDotEnv()
 	sourcePath := strings.TrimSpace(os.Getenv("SQLITE_SOURCE_PATH"))
 	targetDSN := strings.TrimSpace(os.Getenv("DATABASE_URL"))
 	if sourcePath == "" || targetDSN == "" {

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()
 

backend/cmd/server/main.go

@@ -15,6 +15,7 @@ import (
 	"syscall"
 	"time"
 
+	"infinite-canvas/backend/internal/config"
 	"infinite-canvas/backend/internal/database"
 	"infinite-canvas/backend/internal/handler"
 	"infinite-canvas/backend/internal/repository"
@@ -33,6 +34,8 @@ func main() {
 }
 
 func run(ctx context.Context) error {
+	// 先加载仓库根的 .env（若存在），再读取环境变量，保证直连 `go run` 也能读到配置。
+	config.LoadDotEnv()
 	dataDir := env("CANVAS_BACKEND_DATA_DIR", "data")
 	if err := os.MkdirAll(dataDir, 0o755); err != nil {
 		return err
@@ -48,6 +51,7 @@ func run(ctx context.Context) error {
 	if err := database.ConfigurePool(db); err != nil {
 		return err
 	}
+	log.Printf("database driver: %s (DATABASE_URL %s)", db.Dialector.Name(), map[bool]string{true: "set", false: "empty"}[strings.TrimSpace(os.Getenv("DATABASE_URL")) != ""])
 	sqlDB, err := db.DB()
 	if err != nil {
 		return err