feat(memory): add automated nightly consolidation at 4:00 AM UTC

Step 2 of memory system overhaul: automated scheduling.

- New consolidation_scheduler.py: run_nightly_consolidation() function that
  checks Cat health, triggers consolidation via WebSocket, and tracks
  run history with success/failure stats
- bot.py on_ready: register APScheduler cron job (hour=4, minute=0)
  alongside the existing daily DM analysis job
- routes/memory.py: expose consolidation status (last_run, last_result,
  last_error, is_running, total_runs, successful_runs) in the
  /memory/status API response
- Web UI: show consolidation schedule info (last run time, success/fail,
  run counts) below the manual consolidate button, with 'running now'
  indicator when active

The 'sleep consolidation' metaphor is now actually automated instead of
being manual-only.

bot/static/js/memories.js

@@ -39,6 +39,30 @@ async function refreshMemoryStats() {
       document.getElementById('stat-declarative-count').textContent = '—';
       document.getElementById('stat-procedural-count').textContent = '—';
     }
+
+    // Show consolidation schedule info if available
+    const consInfo = document.getElementById('consolidation-schedule-info');
+    if (consInfo && statusData.consolidation) {
+      let infoHtml = '';
+      const cons = statusData.consolidation;
+      if (cons.last_run) {
+        const lastRun = new Date(cons.last_run).toLocaleString();
+        infoHtml += `🕐 Last run: ${lastRun}`;
+        if (cons.last_error) {
+          infoHtml += ` <span style="color: #ff6b6b;">❌ ${escapeHtml(cons.last_error)}</span>`;
+        } else if (cons.last_result) {
+          infoHtml += ` <span style="color: #6fdc6f;">✅</span>`;
+        }
+        infoHtml += `<br>`;
+      } else {
+        infoHtml += `🕐 Last run: never<br>`;
+      }
+      infoHtml += `📊 Runs: ${cons.successful_runs}/${cons.total_runs} successful`;
+      if (cons.is_running) {
+        infoHtml += ` <span style="color: #dcb06f;">⏳ (running now)</span>`;
+      }
+      consInfo.innerHTML = infoHtml;
+    }
   } catch (err) {
     console.error('Error refreshing memory stats:', err);
     document.getElementById('cat-status-indicator').innerHTML = '<span style="color: #ff6b6b;">● Error checking status</span>';