Download MD no histórico, relatórios externos e service systemd

- Botão de download .md no modal de detalhe do histórico (agente e pipeline)
- Relatórios de execução gravados também em ~/agent_reports/ (configurável via AGENT_REPORTS_DIR)
- Service systemd (user) para iniciar o orchestrator no boot com auto-restart

public/js/utils.js

@@ -35,6 +35,71 @@ const Utils = {
     if (pending.length === 0) return;
     lucide.createIcons();
   },
+
+  formatFileSize(bytes) {
+    if (bytes < 1024) return bytes + ' B';
+    if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(1) + ' KB';
+    return (bytes / (1024 * 1024)).toFixed(1) + ' MB';
+  },
+
+  initDropzone(dropzoneId, fileInputId, fileListId) {
+    const zone = document.getElementById(dropzoneId);
+    const input = document.getElementById(fileInputId);
+    const list = document.getElementById(fileListId);
+    if (!zone || !input || !list) return null;
+
+    const state = { files: [] };
+
+    function render() {
+      list.innerHTML = state.files.map((f, i) => `
+        <li class="dropzone-file">
+          <span class="dropzone-file-name">${Utils.escapeHtml(f.name)}</span>
+          <span class="dropzone-file-size">${Utils.formatFileSize(f.size)}</span>
+          <button type="button" class="dropzone-file-remove" data-index="${i}" title="Remover">&times;</button>
+        </li>
+      `).join('');
+
+      const content = zone.querySelector('.dropzone-content');
+      if (content) content.style.display = state.files.length > 0 ? 'none' : '';
+    }
+
+    function addFiles(fileList) {
+      for (const f of fileList) {
+        if (state.files.length >= 20) break;
+        if (f.size > 10 * 1024 * 1024) continue;
+        const dupe = state.files.some(x => x.name === f.name && x.size === f.size);
+        if (!dupe) state.files.push(f);
+      }
+      render();
+    }
+
+    zone.addEventListener('click', (e) => {
+      if (e.target.closest('.dropzone-file-remove')) {
+        const idx = parseInt(e.target.closest('.dropzone-file-remove').dataset.index);
+        state.files.splice(idx, 1);
+        render();
+        return;
+      }
+      if (!e.target.closest('.dropzone-file')) input.click();
+    });
+
+    input.addEventListener('change', () => {
+      if (input.files.length > 0) addFiles(input.files);
+      input.value = '';
+    });
+
+    zone.addEventListener('dragover', (e) => { e.preventDefault(); zone.classList.add('dragover'); });
+    zone.addEventListener('dragleave', () => zone.classList.remove('dragover'));
+    zone.addEventListener('drop', (e) => {
+      e.preventDefault();
+      zone.classList.remove('dragover');
+      if (e.dataTransfer.files.length > 0) addFiles(e.dataTransfer.files);
+    });
+
+    state.reset = () => { state.files = []; render(); };
+    state.getFiles = () => state.files;
+    return state;
+  },
 };
 
 window.Utils = Utils;