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/tenant/transport/knowledge_handler.go

@@ -23,8 +23,10 @@ func NewKnowledgeHandler(a *bootstrap.App) *KnowledgeHandler {
 			a.RetrievalProvider,
 			a.VectorStore,
 			a.ObjectStorage,
+			a.LLM,
 			a.Logger,
 			a.Config.Retrieval,
+			a.Config.LLM,
 			a.Config.Generation.QueueSize,
 			a.Config.Generation.WorkerConcurrency,
 		),
@@ -108,6 +110,21 @@ func (h *KnowledgeHandler) ListItems(c *gin.Context) {
 	response.Success(c, data)
 }
 
+func (h *KnowledgeHandler) GetItemDetail(c *gin.Context) {
+	itemID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		response.Error(c, response.ErrBadRequest(40001, "invalid_id", "knowledge item id must be a number"))
+		return
+	}
+
+	data, err := h.svc.GetItemDetail(c.Request.Context(), itemID)
+	if err != nil {
+		response.Error(c, err)
+		return
+	}
+	response.Success(c, data)
+}
+
 func (h *KnowledgeHandler) CreateTextItem(c *gin.Context) {
 	var req app.KnowledgeTextItemRequest
 	if err := c.ShouldBindJSON(&req); err != nil {