Add optional toggle for Relationship Status Fields (v2.1.2)

- Added relationships.enabled toggle in tracker configuration
- Relationship fields and emoji badges can now be disabled/enabled
- UI toggle added in Edit Trackers > Present Characters tab
- Updated prompt generation to respect the toggle
- Maintains backward compatibility with existing configs
- Added i18n translations (en, zh-tw)

src/core/persistence.js

@@ -550,6 +550,21 @@ function migrateToTrackerConfig() {
                 'Neutral': '⚖️'
             };
         }
+
+        // Migrate to new relationships structure if not already present
+        if (!pc.relationships) {
+            pc.relationships = {
+                enabled: true, // Default to enabled for backward compatibility
+                relationshipEmojis: pc.relationshipEmojis || {
+                    'Lover': '❤️',
+                    'Friend': '⭐',
+                    'Ally': '🤝',
+                    'Enemy': '⚔️',
+                    'Neutral': '⚖️'
+                }
+            };
+        }
+
         if (!pc.thoughts) {
             pc.thoughts = {
                 enabled: true,