feat: add knowledge directory management for documents and FAQs

- Implemented directory validation in Create and Update knowledge document services.
- Added directory selection in document and FAQ edit dialogs with a new KnowledgeDirectoryPanel component.
- Enhanced API to support fetching, creating, updating, and deleting knowledge directories.
- Updated data models to include directory information for knowledge documents and FAQs.
- Added translations for directory-related messages in English and Chinese.

internal/ai/rag/index_document_helpers.go

@@ -47,6 +47,7 @@ func (s *index) prepareDocumentVectors(ctx context.Context, knowledgeBase models
 	vectors := make([]vectordb.Vector, 0, len(chunks))
 	chunkModels := make([]models.KnowledgeChunk, 0, len(chunks))
 	dimension := 0
+	directoryPath := loadKnowledgeDirectoryPath(document.DirectoryID)
 
 	for i, chunk := range chunks {
 		embeddingResult, err := ai.Embedding.GenerateEmbedding(ctx, chunk.Content)
@@ -65,6 +66,7 @@ func (s *index) prepareDocumentVectors(ctx context.Context, knowledgeBase models
 				providerName = value
 			}
 		}
+		sectionPath := joinKnowledgeSectionPath(directoryPath, chunk.SectionPath)
 		now := time.Now()
 		chunkModels = append(chunkModels, models.KnowledgeChunk{
 			KnowledgeBaseID: knowledgeBase.ID,
@@ -76,7 +78,7 @@ func (s *index) prepareDocumentVectors(ctx context.Context, knowledgeBase models
 			CharCount:       chunk.CharCount,
 			TokenCount:      chunk.TokenCount,
 			ChunkType:       string(chunk.ChunkType),
-			SectionPath:     chunk.SectionPath,
+			SectionPath:     sectionPath,
 			Provider:        providerName,
 			VectorID:        chunkID,
 			Status:          enums.StatusOk,
@@ -93,7 +95,7 @@ func (s *index) prepareDocumentVectors(ctx context.Context, knowledgeBase models
 				DocumentTitle:   document.Title,
 				ChunkNo:         chunk.ChunkNo,
 				ChunkType:       string(chunk.ChunkType),
-				SectionPath:     chunk.SectionPath,
+				SectionPath:     sectionPath,
 				Content:         chunk.Content,
 				Title:           chunk.Title,
 				Provider:        providerName,

internal/ai/rag/index_faq_helpers.go

@@ -14,6 +14,7 @@ import (
 func buildFAQChunkModel(knowledgeBase models.KnowledgeBase, faq models.KnowledgeFAQ, content string) (models.KnowledgeChunk, string) {
 	chunkID := buildKnowledgeFAQChunkVectorID(knowledgeBase.ID, faq.ID, 0)
 	now := time.Now()
+	sectionPath := loadKnowledgeDirectoryPath(faq.DirectoryID)
 	return models.KnowledgeChunk{
 		KnowledgeBaseID: knowledgeBase.ID,
 		FaqID:           faq.ID,
@@ -24,6 +25,7 @@ func buildFAQChunkModel(knowledgeBase models.KnowledgeBase, faq models.Knowledge
 		CharCount:       len([]rune(content)),
 		TokenCount:      len([]rune(content)) / 2,
 		ChunkType:       string(enums.KnowledgeChunkTypeFAQ),
+		SectionPath:     sectionPath,
 		Provider:        string(enums.KnowledgeChunkProviderFAQ),
 		VectorID:        chunkID,
 		Status:          enums.StatusOk,
@@ -39,6 +41,7 @@ func (s *index) prepareFAQVector(ctx context.Context, knowledgeBase models.Knowl
 	}
 
 	chunkModel, chunkID := buildFAQChunkModel(knowledgeBase, faq, content)
+	sectionPath := chunkModel.SectionPath
 	vector := vectordb.Vector{
 		ID:     chunkID,
 		Vector: embeddingResult.Vector,
@@ -48,6 +51,7 @@ func (s *index) prepareFAQVector(ctx context.Context, knowledgeBase models.Knowl
 			FaqQuestion:     faq.Question,
 			ChunkNo:         0,
 			ChunkType:       string(enums.KnowledgeChunkTypeFAQ),
+			SectionPath:     sectionPath,
 			Content:         content,
 			Title:           faq.Question,
 			Provider:        string(enums.KnowledgeChunkProviderFAQ),

internal/ai/rag/index_flow.go

@@ -2,6 +2,7 @@ package rag
 
 import (
 	"fmt"
+	"strings"
 
 	"agent-desk/internal/models"
 	"agent-desk/internal/pkg/enums"
@@ -18,6 +19,35 @@ func (s *index) loadDocumentByID(documentID int64) (*models.KnowledgeDocument, e
 	return document, nil
 }
 
+func loadKnowledgeDirectoryPath(directoryID int64) string {
+	if directoryID <= 0 {
+		return ""
+	}
+	item := repositories.KnowledgeDirectoryRepository.Get(sqls.DB(), directoryID)
+	if item == nil {
+		return ""
+	}
+	if item.ParentID <= 0 {
+		return item.Name
+	}
+	parent := repositories.KnowledgeDirectoryRepository.Get(sqls.DB(), item.ParentID)
+	if parent == nil {
+		return item.Name
+	}
+	return parent.Name + " / " + item.Name
+}
+
+func joinKnowledgeSectionPath(parts ...string) string {
+	ret := make([]string, 0, len(parts))
+	for _, item := range parts {
+		item = strings.TrimSpace(item)
+		if item != "" {
+			ret = append(ret, item)
+		}
+	}
+	return strings.Join(ret, " / ")
+}
+
 func (s *index) loadFAQByID(faqID int64) (*models.KnowledgeFAQ, error) {
 	faq := repositories.KnowledgeFAQRepository.Get(sqls.DB(), faqID)
 	if faq == nil {