feat: support folder index pages

apps/server/internal/docs/service.go

@@ -104,10 +104,22 @@ func (s *Service) LoadPage(ctx context.Context, requestPath string) (*Page, erro
 		return nil, err
 	}
 
-	normalized := normalizeRequestPath(requestPath)
-	record, err := s.repo.GetDocumentByPath(ctx, normalized)
-	if err != nil {
-		return nil, err
+	var (
+		record     *DocumentRecord
+		normalized string
+		lastErr    error
+	)
+	for _, candidate := range normalizeRequestPathCandidates(requestPath) {
+		found, err := s.repo.GetDocumentByPath(ctx, candidate)
+		if err == nil {
+			record = found
+			normalized = candidate
+			break
+		}
+		lastErr = err
+	}
+	if record == nil {
+		return nil, lastErr
 	}
 
 	content, err := s.store.Read(record.CurrentHash)
@@ -129,15 +141,15 @@ func (s *Service) LoadPage(ctx context.Context, requestPath string) (*Page, erro
 	}, nil
 }
 
-func normalizeRequestPath(path string) string {
+func normalizeRequestPathCandidates(path string) []string {
 	path = strings.Trim(path, "/")
 	if path == "" {
-		return "getting-started.md"
+		return []string{"index.md", "getting-started.md"}
 	}
 	if !strings.HasSuffix(path, ".md") {
-		path += ".md"
+		return []string{path + ".md", path + "/index.md"}
 	}
-	return path
+	return []string{path}
 }
 
 func (s *Service) syncFile(ctx context.Context, path string) (*DocumentChange, error) {