fix

Service/AI/PromptTemplateEngine.cs

@@ -0,0 +1,66 @@
+namespace Service.AI;
+
+/// <summary>
+/// 提示词模板引擎，处理占位符替换
+/// </summary>
+public class PromptTemplateEngine
+{
+    /// <summary>
+    /// 替换模板中的占位符
+    /// </summary>
+    /// <param name="template">模板字符串，支持 {{key}} 格式的占位符</param>
+    /// <param name="placeholders">占位符字典，key 为占位符名称（不含 {{ }}），value 为替换值</param>
+    /// <returns>替换后的字符串</returns>
+    public static string ReplacePlaceholders(string template, Dictionary<string, string> placeholders)
+    {
+        if (string.IsNullOrEmpty(template) || placeholders == null || placeholders.Count == 0)
+        {
+            return template;
+        }
+
+        var result = template;
+        foreach (var placeholder in placeholders)
+        {
+            var key = placeholder.Key;
+            var value = placeholder.Value ?? string.Empty;
+            result = result.Replace($"{{{{{key}}}}}", value);
+        }
+
+        return result;
+    }
+
+    /// <summary>
+    /// 替换模板中的占位符（简化版本）
+    /// </summary>
+    /// <param name="template">模板字符串</param>
+    /// <param name="categoryName">分类名称</param>
+    /// <param name="categoryType">分类类型</param>
+    /// <param name="colorScheme">颜色方案</param>
+    /// <param name="styleStrength">风格强度（0.0-1.0）</param>
+    /// <returns>替换后的字符串</returns>
+    public static string ReplaceForIconGeneration(
+        string template,
+        string categoryName,
+        string categoryType,
+        string colorScheme,
+        double styleStrength)
+    {
+        var strengthDescription = styleStrength switch
+        {
+            >= 0.9 => "极度简约（仅保留最核心元素）",
+            >= 0.7 => "高度简约（去除所有装饰）",
+            >= 0.5 => "简约（保留必要细节）",
+            _ => "适中"
+        };
+
+        var placeholders = new Dictionary<string, string>
+        {
+            ["category_name"] = categoryName,
+            ["category_type"] = categoryType,
+            ["color_scheme"] = colorScheme,
+            ["style_strength"] = $"{styleStrength:F1} - {strengthDescription}"
+        };
+
+        return ReplacePlaceholders(template, placeholders);
+    }
+}