feat: harden support, localize knowledge and add operator availability [skip ci]

Source-only publication of reviewed commit 64e96a7f423673dc29ad56485be9fc79bce8af1c.

Passed in isolation: focused frontend/backend tests, race checks, TypeScript typecheck, lint, Go compilation, Flowgram build, and deterministic SDK build/tests.

Not accepted as a production release: Next.js export/native assembly remains blocked by environment memory limits; browser interaction and MySQL staging acceptance remain unverified. No production server, database/schema, runtime configuration, deployment, release tag, or workflow execution was performed.

Expected source tree: 0a4a7528e9.

internal/ai/rag/index.go

@@ -1,10 +1,10 @@
+// Modified in the independent AgentDesk fork: localized knowledge workflows and safe display errors.
 package rag
 
 import (
 	"context"
 	"crypto/sha256"
 	"encoding/hex"
-	"encoding/json"
 	"fmt"
 	"log/slog"
 	"time"
@@ -47,6 +47,9 @@ var Index = &index{
 }
 
 func (s *index) IndexDocumentByID(ctx context.Context, documentID int64) error {
+	if err := ctx.Err(); err != nil {
+		return err
+	}
 	document, err := s.loadDocumentByID(documentID)
 	if err != nil {
 		return err
@@ -55,6 +58,9 @@ func (s *index) IndexDocumentByID(ctx context.Context, documentID int64) error {
 }
 
 func (s *index) IndexDocument(ctx context.Context, document models.KnowledgeDocument) error {
+	if err := ctx.Err(); err != nil {
+		return err
+	}
 	start := time.Now()
 	if err := s.markDocumentIndexPending(document.ID); err != nil {
 		slog.Error("Failed to mark knowledge document index as pending", "document_id", document.ID, "error", err)
@@ -92,6 +98,9 @@ func (s *index) IndexDocument(ctx context.Context, document models.KnowledgeDocu
 }
 
 func (s *index) IndexFAQByID(ctx context.Context, faqID int64) error {
+	if err := ctx.Err(); err != nil {
+		return err
+	}
 	faq, err := s.loadFAQByID(faqID)
 	if err != nil {
 		return err
@@ -288,43 +297,6 @@ func (s *index) RebuildKnowledgeBaseIndex(ctx context.Context, knowledgeBaseID i
 	return nil
 }
 
-func buildFAQChunkContent(faq models.KnowledgeFAQ) string {
-	parts := []string{fmt.Sprintf("问题：%s", faq.Question)}
-	var similarQuestions []string
-	if faq.SimilarQuestions != "" {
-		_ = json.Unmarshal([]byte(faq.SimilarQuestions), &similarQuestions)
-	}
-	if len(similarQuestions) > 0 {
-		parts = append(parts, fmt.Sprintf("相似问：%s", joinSimilarQuestions(similarQuestions)))
-	}
-	parts = append(parts, fmt.Sprintf("回答：%s", faq.Answer))
-	content := ""
-	for _, part := range parts {
-		if part == "" {
-			continue
-		}
-		if content != "" {
-			content += "\n"
-		}
-		content += part
-	}
-	return content
-}
-
-func joinSimilarQuestions(items []string) string {
-	result := ""
-	for _, item := range items {
-		if item == "" {
-			continue
-		}
-		if result != "" {
-			result += "；"
-		}
-		result += item
-	}
-	return result
-}
-
 func (s *index) resetKnowledgeBaseIndexStorage(ctx context.Context, knowledgeBaseID int64) error {
 	chunks := repositories.KnowledgeChunkRepository.FindByKnowledgeBaseID(sqls.DB(), knowledgeBaseID)
 	return s.cleanupKnowledgeBaseChunks(ctx, knowledgeBaseID, chunks)