feat: add Central API clients, bot rate limiting, and admin API UI

- Add ITK_HP_API and ITK_Bot_API static classes with queue/flush/cron
- Add WP-Cron (5 min) + shutdown flush for both API queues
- Bot Blocker and Honeypot now queue events to their respective APIs
- Admin: Bot Blocker tab gains Central Bot API settings panel
  (enable, URL, token, test connection, flush queue, historical sync)
- Admin: Honeypot tab gains Central Honeypot API settings panel
- Admin JS: AJAX handlers for Test Connection and Flush Now buttons
- Admin CSS: API card styles (status badge, notices, footer controls)
- Add .gitignore (excludes bot-api/ which lives in CloudHost/bot-api)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

assets/css/admin.css

@@ -308,3 +308,60 @@ input:checked + .itk-slider:before { transform: translateX(20px); }
 .itk-toggle-saving { opacity: .6; pointer-events: none; }
 .itk-toggle-saved  { color: #00a32a; font-size: 11px; }
 .itk-toggle-error  { color: #b32d2e; font-size: 11px; }
+
+/* ── Central API card ─────────────────────────────────────── */
+.itk-api-card { grid-column: 1 / -1; }
+.itk-api-desc { margin: -8px 0 14px; color: #646970; }
+
+.itk-api-status-bar {
+    display: flex;
+    align-items: center;
+    flex-wrap: wrap;
+    gap: 10px;
+    margin-bottom: 14px;
+    padding: 8px 12px;
+    background: #f6f7f7;
+    border: 1px solid #e5e5e5;
+    border-radius: 4px;
+}
+.itk-api-badge {
+    display: inline-block;
+    padding: 3px 10px;
+    border-radius: 12px;
+    font-size: 11px;
+    font-weight: 700;
+    letter-spacing: .5px;
+    text-transform: uppercase;
+}
+.itk-api-ok      { background: #d7f7e0; color: #1a7a3a; border: 1px solid #9de0b4; }
+.itk-api-err     { background: #ffecec; color: #b32d2e; border: 1px solid #f7c5c5; }
+.itk-api-unknown { background: #f0f0f1; color: #646970; border: 1px solid #c3c4c7; }
+.itk-api-time    { font-size: 11px; color: #646970; }
+.itk-api-err-msg { font-size: 11px; color: #b32d2e; font-style: italic; }
+
+.itk-api-notice {
+    padding: 8px 12px;
+    border-radius: 4px;
+    font-size: 13px;
+    margin-bottom: 12px;
+}
+.itk-api-notice-ok  { background: #d7f7e0; border: 1px solid #9de0b4; color: #1a7a3a; }
+.itk-api-notice-err { background: #ffecec; border: 1px solid #f7c5c5; color: #b32d2e; }
+
+.itk-api-table { margin-top: 0 !important; }
+.itk-api-table th { width: 130px; }
+
+.itk-api-form-actions { margin-top: 4px; display: flex; align-items: center; flex-wrap: wrap; gap: 6px; }
+
+.itk-api-footer {
+    margin-top: 16px;
+    padding-top: 14px;
+    border-top: 1px solid #e5e5e5;
+    display: flex;
+    flex-wrap: wrap;
+    gap: 12px 30px;
+    align-items: flex-start;
+}
+.itk-api-queue-row,
+.itk-api-history-row { font-size: 13px; display: flex; align-items: center; flex-wrap: wrap; gap: 6px; }
+.itk-api-rem { color: #646970; font-size: 12px; }