refactor: integra reconcile no boot, dedup categoria/pasta, CI, Go 1.24

- Boot chama ReconcileBlobs com log de órfãos (era código morto)
- treeNode/validTreeName/siblingDup/moveCreatesCycle compartilhados
  entre Create/Update Category/Folder (mesma regra, um só lugar)
- mapStoreErrorFor com mensagens 404 por recurso (nota/arquivo/pasta/categoria)
- revisionHash helper + teste GET /revisions/{hash} (200 + 404)
- ReconcileBlobs com lock curto (coleta sob RLock, I/O fora do lock)
- AddFile com LimitReader no stream (cap antes de gravar, não depois)
- DeleteFile/DeleteFolder transacionais com rollback em memória
- attachmentKind único no frontend (syntax/html/preview)
- CI: gofmt, vet, test -race, node --check; go.mod 1.24 = Dockerfile
- README: notas operacionais (memória, proxy, boot, SSE, 413/400)

internal/api/categories.go

@@ -12,7 +12,6 @@ type categoryInput struct {
 func (s *Server) handleCreateCategory(w http.ResponseWriter, r *http.Request) {
 	var in categoryInput
 	if err := decodeJSON(w, r, &in, 1<<20); err != nil {
-		writeError(w, http.StatusBadRequest, "corpo JSON inválido")
 		return
 	}
 	parent := ""
@@ -21,7 +20,7 @@ func (s *Server) handleCreateCategory(w http.ResponseWriter, r *http.Request) {
 	}
 	c, err := s.st.CreateCategory(in.Name, parent)
 	if err != nil {
-		mapStoreError(w, err)
+		mapStoreErrorFor(w, err, "categoria")
 		return
 	}
 	writeJSON(w, http.StatusCreated, c)
@@ -30,12 +29,11 @@ func (s *Server) handleCreateCategory(w http.ResponseWriter, r *http.Request) {
 func (s *Server) handleUpdateCategory(w http.ResponseWriter, r *http.Request) {
 	var in categoryInput
 	if err := decodeJSON(w, r, &in, 1<<20); err != nil {
-		writeError(w, http.StatusBadRequest, "corpo JSON inválido")
 		return
 	}
 	c, err := s.st.UpdateCategory(r.PathValue("id"), in.Name, in.Parent)
 	if err != nil {
-		mapStoreError(w, err)
+		mapStoreErrorFor(w, err, "categoria")
 		return
 	}
 	writeJSON(w, http.StatusOK, c)
@@ -43,7 +41,7 @@ func (s *Server) handleUpdateCategory(w http.ResponseWriter, r *http.Request) {
 
 func (s *Server) handleDeleteCategory(w http.ResponseWriter, r *http.Request) {
 	if err := s.st.DeleteCategory(r.PathValue("id")); err != nil {
-		mapStoreError(w, err)
+		mapStoreErrorFor(w, err, "categoria")
 		return
 	}
 	w.WriteHeader(http.StatusNoContent)