feat: add knowledge markdown formatting and detail retrieval

- Implemented KnowledgeWebsiteMarkdownPrompt for formatting webpage content into Markdown.
- Added GetItemDetail method in KnowledgeHandler to retrieve knowledge item details.
- Introduced KnowledgeDetailDrawer component for displaying knowledge item details in the admin web interface.
- Created MarkdownPreview component for rendering Markdown content.
- Added knowledge chunking and URL parsing logic to handle webpage content extraction and formatting.
- Updated database schema to include markdown_content in knowledge_items table.

server/internal/shared/llm/ark.go

@@ -113,6 +113,11 @@ func (c *arkClient) Generate(ctx context.Context, req GenerateRequest, onDelta f
 		maxOutputTokens = req.MaxOutputTokens
 	}
 
+	model := c.model
+	if strings.TrimSpace(req.Model) != "" {
+		model = strings.TrimSpace(req.Model)
+	}
+
 	callCtx, cancel := context.WithTimeout(ctx, timeout)
 	defer cancel()
 
@@ -154,7 +159,7 @@ func (c *arkClient) Generate(ctx context.Context, req GenerateRequest, onDelta f
 	}
 
 	stream, err := c.client.CreateResponsesStream(callCtx, &responses.ResponsesRequest{
-		Model:           c.model,
+		Model:           model,
 		MaxOutputTokens: &maxOutputTokens,
 		Store:           &store,
 		Stream:          &streamValue,
@@ -232,7 +237,7 @@ func (c *arkClient) Generate(ctx context.Context, req GenerateRequest, onDelta f
 
 	return &GenerateResult{
 		Content: result,
-		Model:   c.model,
+		Model:   model,
 	}, nil
 }
 

server/internal/shared/llm/client.go

@@ -13,6 +13,7 @@ import (
 var ErrNotConfigured = errors.New("llm provider is not configured")
 
 type GenerateRequest struct {
+	Model           string
 	Prompt          string
 	Timeout         time.Duration
 	MaxOutputTokens int64