fix: JWT密钥同步、地图初始化时序、API中间件错误处理

- 修复安装完成后JWT密钥未同步到viper内存的问题
- 修复地图在loading状态时DOM元素不存在导致的初始化错误
- 修复AppCryptoMiddleware中数据库错误时未正确返回错误响应的问题
- 添加数据库未初始化检查
- 移除调试日志输出

backend/internal/router/install/install.go

@@ -16,6 +16,7 @@ import (
 
 	"github.com/gin-gonic/gin"
 	"github.com/glebarez/sqlite"
+	"github.com/spf13/viper"
 	"golang.org/x/crypto/bcrypt"
 	"gorm.io/driver/mysql"
 	"gorm.io/gorm"
@@ -232,6 +233,16 @@ func handleSetup(c *gin.Context) {
 		log.Printf("Warning: failed to save config file: %v", err)
 	}
 
+	viper.Set("app.jwt_secret", jwtSecret)
+	viper.Set("database.type", req.DbType)
+	if req.DbType == "mysql" {
+		viper.Set("database.host", req.DbHost)
+		viper.Set("database.port", req.DbPort)
+		viper.Set("database.name", req.DbName)
+		viper.Set("database.username", req.DbUsername)
+		viper.Set("database.password", req.DbPassword)
+	}
+
 	database.DB = newDB
 
 	response.Success(c, gin.H{