feat: 新增财务应用的核心数据模型定义，包含账户、交易类型、货币等枚举。

cmd/migrate/main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"log"
+	"os"
 	"path/filepath"
 
 	"accounting-app/internal/config"
@@ -14,19 +15,36 @@ import (
 func main() {
 	// Load .env file from project root (try multiple locations)
 	envPaths := []string{
-		".env",                          // Current directory
+		".env",                            // Current directory
-		"../.env",                        // Parent directory (when running from backend/)
+		"../.env",                         // Parent directory (when running from backend/)
-		"../../.env",                     // Two levels up (when running from backend/cmd/migrate/)
+		"../../.env",                      // Two levels up (when running from backend/cmd/migrate/)
 		filepath.Join("..", "..", ".env"), // Explicit path
 	}
-	
+
+	var envDir string
 	for _, envPath := range envPaths {
 		if err := godotenv.Load(envPath); err == nil {
-			log.Printf("Loaded environment from: %s", envPath)
+			log.Printf("Loaded base environment from: %s", envPath)
+			envDir = filepath.Dir(envPath)
 			break
 		}
 	}
 
+	// Load specific environment file if APP_ENV is set (e.g. .env.dev, .env.prod)
+	if appEnv := os.Getenv("APP_ENV"); appEnv != "" {
+		targetEnvFile := ".env." + appEnv
+		targetEnvPath := targetEnvFile
+		if envDir != "" && envDir != "." {
+			targetEnvPath = filepath.Join(envDir, targetEnvFile)
+		}
+
+		if err := godotenv.Overload(targetEnvPath); err == nil {
+			log.Printf("Loaded specific environment config from: %s", targetEnvPath)
+		} else {
+			log.Printf("Note: Specific environment file %s not found or could not be loaded", targetEnvPath)
+		}
+	}
+
 	// Load configuration
 	cfg := config.Load()
 

internal/models/models.go

@@ -861,11 +861,12 @@ func AllModels() []interface{} {
 		&OAuthAccount{},
 		&TransactionTemplate{},
 		&UserPreference{},
-		&Ledger{},           // Feature: accounting-feature-upgrade
+		&Ledger{},             // Feature: accounting-feature-upgrade
-		&SystemCategory{},   // Feature: accounting-feature-upgrade
+		&SystemCategory{},     // Feature: accounting-feature-upgrade
-		&TransactionImage{}, // Feature: accounting-feature-upgrade
+		&TransactionImage{},   // Feature: accounting-feature-upgrade
-		&UserSettings{},     // Feature: accounting-feature-upgrade
+		&UserSettings{},       // Feature: accounting-feature-upgrade
-		&Notification{},     // Feature: notification-center
+		&Notification{},       // Feature: notification-center
+		&SystemAnnouncement{}, // Feature: system-announcement
 	}
 }