优化海报保存逻辑，提升导出清晰度，兼容 iOS 设备。更新相关注释以反映画布尺寸和导出分辨率的变化。同时，调整小程序环境变量处理逻辑，确保生成的版本码正确，避免开发版过期问题。

soul-api/internal/wechat/miniprogram.go

@@ -216,9 +216,11 @@ func GenerateMiniProgramCode(scene, page string, width int) ([]byte, error) {
 		scene = scene[:32]
 	}
 
+	// 仅 developer/trial 生成对应版本码，其余一律正式版，避免扫码提示「开发版已过期」
 	envVersion := "release"
-	if cfg != nil && cfg.WechatMiniProgramState != "" {
-		switch cfg.WechatMiniProgramState {
+	if cfg != nil {
+		state := strings.TrimSpace(cfg.WechatMiniProgramState)
+		switch state {
 		case "developer":
 			envVersion = "develop"
 		case "trial":
@@ -227,6 +229,9 @@ func GenerateMiniProgramCode(scene, page string, width int) ([]byte, error) {
 			envVersion = "release"
 		}
 	}
+	if cfg != nil {
+		fmt.Printf("[GenerateMiniProgramCode] env_version=%s (WechatMiniProgramState=%q)\n", envVersion, cfg.WechatMiniProgramState)
+	}
 	reqBody := map[string]interface{}{
 		"scene":       scene,
 		"page":        page,