feat(ui): hide DO-manual, OCR engine, require-plat on office page

display:none only — element IDs, JS handlers and endpoints stay intact,
so re-enabling is dropping three inline styles. Default batch mode is
manual for the POC, so operators shouldn't see DO/OCR controls.

templates/monitoring.html

@@ -310,7 +310,7 @@
                     <button id="btnModeAuto" class="btn btn-sm" style="padding: 4px 10px; font-size: 11px; border-radius: 18px; border: none; background: transparent; color: var(--text-secondary);" onclick="switchBatchMode('auto')">
                         <i class="fa-solid fa-robot"></i> Otomatis
                     </button>
-                    <button id="btnModeDoManual" class="btn btn-sm" style="padding: 4px 10px; font-size: 11px; border-radius: 18px; border: none; background: transparent; color: var(--text-secondary);" onclick="switchBatchMode('do_manual')">
+                    <button id="btnModeDoManual" class="btn btn-sm" style="display:none; padding: 4px 10px; font-size: 11px; border-radius: 18px; border: none; background: transparent; color: var(--text-secondary);" onclick="switchBatchMode('do_manual')">
                         <i class="fa-solid fa-file-lines"></i> DO Manual
                     </button>
                     <button id="btnModeManual" class="btn btn-sm" style="padding: 4px 10px; font-size: 11px; border-radius: 18px; border: none; background: transparent; color: var(--text-secondary);" onclick="switchBatchMode('manual')">
@@ -350,7 +350,7 @@
                     <span class="meta-key">Pipeline Speed</span>
                     <span class="meta-value"><span id="liveFps">--</span> FPS</span>
                 </div>
-                <div class="meta-item">
+                <div class="meta-item" style="display:none;">
                     <span class="meta-key">OCR Engine</span>
                     <span class="meta-value">
                         <select id="monOcrEngine" style="padding:4px 8px;border-radius:8px;border:1px solid var(--border-color);background:var(--bg-base);color:var(--text-primary);font-size:12px;" onchange="setOcrEngine(this.value)">
@@ -361,7 +361,7 @@
                         </select>
                     </span>
                 </div>
-                <div class="meta-item">
+                <div class="meta-item" style="display:none;">
                     <span class="meta-key">Require plat</span>
                     <span class="meta-value">
                         <label style="font-weight:400;">