Add feedback system functionality

- Implement feedback management system in admin interface
- Add feedback processing and AI-based features
- Update user interface with new feedback components
- Modify server-side API endpoints for feedback handling
- Enhance worker.js for background feedback processing
- Update deployment configuration for feedback components

Co-authored-by: openhands <openhands@all-hands.dev>

public/admin.css

@@ -81,6 +81,9 @@ body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;b
 .filters{display:flex;gap:8px;margin-bottom:20px;flex-wrap:wrap;align-items:flex-end}
 .filters select,.filters input[type=date]{background:var(--card);border:1px solid var(--border);color:var(--text);border-radius:8px;padding:8px 12px;font-size:.85rem}
 .filters label{font-size:.8rem;color:var(--muted);display:block;margin-bottom:4px}
+.filters label.toggle{display:flex;align-items:center;gap:8px;margin-bottom:0;padding:6px 10px;color:var(--text);background:transparent;border-color:transparent;min-width:0}
+.filters label.toggle .toggle-text{font-size:.8rem;white-space:nowrap}
+.filters > div{min-width:0}
 .search-input{background:var(--card);border:1px solid var(--border);color:var(--text);border-radius:8px;padding:8px 12px;font-size:.85rem;outline:none}
 .search-input:focus{border-color:var(--accent)}
 #studentFilter,#linkStudent,#moduleFilter{background:var(--card);border:1px solid var(--border);color:var(--text);border-radius:8px;padding:8px 12px;font-size:.85rem;outline:none;width:100%;max-width:220px}
@@ -489,6 +492,7 @@ body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;b
 .ai-badge-done{background:rgba(22,163,74,.12);color:#16a34a}
 .ai-badge-error{background:rgba(239,68,68,.12);color:#ef4444}
 .ai-badge-skipped,.ai-badge-reverted{background:rgba(148,163,184,.18);color:var(--muted)}
+.ai-badge-sent{background:rgba(20,184,166,.12);color:#14b8a6}
 .ai-badge-ic.ai-badge-processing .lucide-loader{animation:spin 1s linear infinite}
 @keyframes spin{to{transform:rotate(360deg)}}
 .ai-details{background:none;border:none;padding:0;margin:0;color:var(--accent);font-size:.8rem;cursor:pointer;white-space:nowrap}