v1.9.1: fix world map rendering and resolve eight small TODO items

World map:
- Fix zero-padded ISO numeric ids leaving 31 countries unrendered
  (Brazil, Australia, Belgium, Austria, Algeria and more)
- Fix Russia and Fiji smearing across the full map width at the antimeridian
  by unwrapping ring longitudes and drawing them at both edges
- Crop to 84N-60S, add evenodd fill rule, 174 countries rendered

Improvements:
- Logger::tail() reads backwards in chunks instead of loading the whole file
- External links get rel=noopener noreferrer in footer and Markdown content
- formatDisplayName() cleaned up and guarded against empty input
- Export statistics as CSV (Excel BOM) or JSON
- GeoIP database auto-updates when older than 35 days
- Editor shortcuts Ctrl/Cmd+S to save and Ctrl/Cmd+N for a new page
- Live search filter in the admin content browser
- Content versioning with timestamped .bak copies in content/-backups/

Also removes eight stale TODO entries that were already implemented

public/assets/js/editor-toolbar.js

@@ -230,4 +230,37 @@
     document.getElementById('editor-form').addEventListener('submit', function () {
         editor.save();
     });
+
+    // Keyboard shortcuts: Ctrl/Cmd+S saves, Ctrl/Cmd+N creates a new page
+    function handleShortcut(e) {
+        var mod = e.ctrlKey || e.metaKey;
+        if (!mod || e.altKey) return;
+
+        var key = (e.key || '').toLowerCase();
+
+        if (key === 's') {
+            e.preventDefault();
+            editor.save();
+            if (form) {
+                if (typeof form.requestSubmit === 'function') {
+                    form.requestSubmit();
+                } else {
+                    form.submit();
+                }
+            }
+            return;
+        }
+
+        if (key === 'n') {
+            e.preventDefault();
+            window.location.href = '/admin/content-new';
+        }
+    }
+
+    document.addEventListener('keydown', handleShortcut);
+    // CodeMirror swallows keystrokes inside the editor, so bind there too
+    editor.setOption('extraKeys', Object.assign({}, editor.getOption('extraKeys') || {}, {
+        'Ctrl-S': function () { handleShortcut({ ctrlKey: true, key: 's', preventDefault: function () {} }); },
+        'Cmd-S': function () { handleShortcut({ metaKey: true, key: 's', preventDefault: function () {} }); }
+    }));
 })();