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)

web/js/app.js

@@ -2371,27 +2371,24 @@
       ? 'Anexo(s) inserido(s) no editor' : `Inseridos ${done.length}/${files.length}`);
   }
 
+  function attachmentKind(f) {
+    const mime = f.mime || '';
+    if (mime.startsWith('image/') && mime !== 'image/svg+xml') return 'img';
+    if (mime.startsWith('video/')) return 'vid';
+    if (mime.startsWith('audio/')) return 'aud';
+    return 'doc';
+  }
   function attachmentSyntax(f, fmt) {
-    const isImg = f.mime.startsWith('image/') && f.mime !== 'image/svg+xml';
-    const isVid = f.mime.startsWith('video/');
-    const isAud = f.mime.startsWith('audio/');
-    if (fmt === 'html') {
-      if (isImg) return `<img src="${f.url}" alt="${esc(f.name)}">`;
-      if (isVid) return `<video controls src="${f.url}"></video>`;
-      if (isAud) return `<audio controls src="${f.url}"></audio>`;
-      return `<a href="${f.url}" target="_blank" rel="noopener">${esc(f.name)}</a>`;
-    }
-    if (isImg) return `![${f.name}](${f.url})`;
-    return `[${(isVid ? '▶ ' : isAud ? ' ' : '') + f.name}](${f.url})`;
+    const kind = attachmentKind(f);
+    if (fmt === 'html') return attachmentHtml(f);
+    if (kind === 'img') return `![${f.name}](${f.url})`;
+    return `[${(kind === 'vid' ? '▶ ' : kind === 'aud' ? ' ' : '') + f.name}](${f.url})`;
   }
-
   function attachmentHtml(f) {
-    const isImg = f.mime.startsWith('image/') && f.mime !== 'image/svg+xml';
-    const isVid = f.mime.startsWith('video/');
-    const isAud = f.mime.startsWith('audio/');
-    if (isImg) return `<img src="${f.url}" alt="${esc(f.name)}">`;
-    if (isVid) return `<video controls src="${f.url}"></video>`;
-    if (isAud) return `<audio controls src="${f.url}"></audio>`;
+    const kind = attachmentKind(f);
+    if (kind === 'img') return `<img src="${f.url}" alt="${esc(f.name)}">`;
+    if (kind === 'vid') return `<video controls src="${f.url}"></video>`;
+    if (kind === 'aud') return `<audio controls src="${f.url}"></audio>`;
     return `<a href="${f.url}" target="_blank" rel="noopener">${esc(f.name)}</a>`;
   }
 
@@ -2436,14 +2433,12 @@
     F.lbDl.href = f.url;
     F.lbDl.setAttribute('download', f.name);
     F.lbBody.textContent = '';
-    const isImg = f.mime.startsWith('image/') && f.mime !== 'image/svg+xml';
-    const isVid = f.mime.startsWith('video/');
-    const isAud = f.mime.startsWith('audio/');
-    if (isImg || isVid || isAud || f.mime.includes('pdf')) {
+    const kind = attachmentKind(f);
+    if (kind !== 'doc' || (f.mime || '').includes('pdf')) {
       let el;
-      if (isImg) { el = document.createElement('img'); el.src = f.url; el.alt = f.name; }
-      else if (isVid) { el = document.createElement('video'); el.src = f.url; el.controls = true; }
-      else if (isAud) { el = document.createElement('audio'); el.src = f.url; el.controls = true; }
+      if (kind === 'img') { el = document.createElement('img'); el.src = f.url; el.alt = f.name; }
+      else if (kind === 'vid') { el = document.createElement('video'); el.src = f.url; el.controls = true; }
+      else if (kind === 'aud') { el = document.createElement('audio'); el.src = f.url; el.controls = true; }
       else { el = document.createElement('iframe'); el.src = f.url; el.title = f.name; }
       F.lbBody.appendChild(el);
     } else {