feat: Add admin navigation, fix modals, clickable stats, update docs

- Add admin dropdown menu in dashboard header with links to all admin pages
- Fix template modal: larger size (800px), responsive grid, type/priority dropdowns
- Fix recurring tickets modal: add Type and Assign To fields, larger size
- Make dashboard stat cards clickable for quick filtering
- Fix user-activity query (remove is_active requirement)
- Add table existence check in ticket_dependencies API
- Fix table overflow on dashboard
- Update Claude.md and README.md with current project status
- Remove migrations directory (all migrations completed)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

assets/css/dashboard.css

@@ -3167,3 +3167,79 @@ tr:hover .quick-actions {
     background: rgba(0, 255, 65, 0.1);
     color: var(--terminal-amber);
 }
+
+/* ===== ADMIN DROPDOWN ===== */
+.admin-dropdown {
+    position: relative;
+    display: inline-block;
+}
+
+.admin-dropdown .admin-badge {
+    cursor: pointer;
+    padding: 0.3rem 0.6rem;
+}
+
+.admin-dropdown-content {
+    display: none;
+    position: absolute;
+    top: 100%;
+    right: 0;
+    background: var(--bg-primary);
+    border: 2px solid var(--priority-1);
+    min-width: 180px;
+    z-index: 1000;
+    box-shadow: 0 0 15px rgba(255, 77, 77, 0.3);
+}
+
+.admin-dropdown-content.show {
+    display: block;
+}
+
+.admin-dropdown-content a {
+    display: block;
+    padding: 0.6rem 1rem;
+    color: var(--terminal-green);
+    text-decoration: none;
+    font-family: var(--font-mono);
+    font-size: 0.85rem;
+    transition: all 0.2s ease;
+    border-bottom: 1px solid var(--bg-tertiary);
+}
+
+.admin-dropdown-content a:last-child {
+    border-bottom: none;
+}
+
+.admin-dropdown-content a:hover {
+    background: rgba(255, 77, 77, 0.1);
+    color: var(--priority-1);
+    text-shadow: var(--glow-red);
+}
+
+/* ===== CLICKABLE STAT CARDS ===== */
+.stat-card:hover {
+    transform: translateY(-2px);
+}
+
+.stat-card:active {
+    transform: translateY(0);
+}
+
+/* ===== TABLE OVERFLOW FIX ===== */
+.ascii-content {
+    overflow-x: auto;
+}
+
+/* Reduce column widths for better fit */
+table th,
+table td {
+    padding: 8px 10px;
+    font-size: 0.85rem;
+}
+
+/* Make title column wrap if needed */
+table td:nth-child(4) {
+    max-width: 180px;
+    overflow: hidden;
+    text-overflow: ellipsis;
+}