feat: Enhance article generation and outline handling

- Added support for external markdown synchronization in ArticleEditorCanvas.vue.
- Implemented a new function to sync markdown from props, ensuring the editor reflects external changes.
- Introduced a removeOutlineSection function in TemplateWizardView.vue to manage outline sections dynamically.
- Updated UI components to improve user experience, including replacing a-input with a-textarea for better text handling.
- Refactored CSS styles for a cleaner layout and improved responsiveness in TemplateWizardView.vue.
- Enhanced LLM generation requests to include response format options in ark.go and client.go.
- Updated template assist logic to enforce structured outline outputs in template_assist.go.
- Added tests for outline result decoding and prompt generation to ensure robustness.
- Created migration scripts to update prompt templates with new writing requirements for top X articles.

server/internal/shared/llm/client.go

@@ -17,6 +17,7 @@ type GenerateRequest struct {
 	Timeout         time.Duration
 	MaxOutputTokens int64
 	WebSearch       *WebSearchOptions
+	ResponseFormat  *ResponseFormat
 }
 
 type GenerateResult struct {
@@ -24,6 +25,22 @@ type GenerateResult struct {
 	Model   string
 }
 
+type ResponseFormat struct {
+	Type        ResponseFormatType
+	Name        string
+	Description string
+	SchemaJSON  []byte
+	Strict      bool
+}
+
+type ResponseFormatType string
+
+const (
+	ResponseFormatTypeText       ResponseFormatType = "text"
+	ResponseFormatTypeJSONObject ResponseFormatType = "json_object"
+	ResponseFormatTypeJSONSchema ResponseFormatType = "json_schema"
+)
+
 type WebSearchOptions struct {
 	Enabled bool
 	Limit   int32