feat(admin): add potential fathers retrieval for character management

- Implemented a new method in AdminService to fetch potential fathers for a given character based on existing relationships.
- Updated AdminController to expose this functionality via a new API endpoint.
- Enhanced adminRouter to include the route for retrieving potential fathers.
- Modified frontend components to allow selection of potential fathers during pregnancy and birth management.
- Updated internationalization files to include new translation keys related to father selection.

frontend/src/views/social/VocabCourseView.vue

@@ -73,6 +73,12 @@
               <span class="title-label">{{ lesson.title }}</span>
               <span v-if="lesson.description" class="lesson-description">{{ lesson.description }}</span>
             </div>
+            <div class="lesson-pedagogy" v-if="lesson.pedagogy">
+              <span class="lesson-chip lesson-chip--phase">{{ getPhaseLabel(lesson.pedagogy.phaseLabel) }}</span>
+              <span class="lesson-chip lesson-chip--mode">{{ getDidacticModeLabel(lesson.pedagogy.didacticMode) }}</span>
+              <span v-if="lesson.pedagogy.blockNumber" class="lesson-chip lesson-chip--block">Block {{ lesson.pedagogy.blockNumber }}</span>
+              <span v-if="lesson.pedagogy.isIntensiveReview" class="lesson-chip lesson-chip--intensive">Intensive Wiederholung</span>
+            </div>
             <div class="lesson-actions-content">
               <button 
                 @click="openLesson(lesson.id)" 
@@ -328,6 +334,36 @@ export default {
     openLanguageAssistantSettings() {
       this.$router.push('/settings/language-assistant');
     },
+    getPhaseLabel(phaseLabel) {
+      switch (phaseLabel) {
+        case 'quickstart':
+          return 'Schnellstart';
+        case 'daily_life':
+          return 'Alltag';
+        case 'stabilization':
+          return 'Stabilisierung';
+        default:
+          return 'Lernphase';
+      }
+    },
+    getDidacticModeLabel(didacticMode) {
+      switch (didacticMode) {
+        case 'core_input':
+          return 'Neuer Stoff';
+        case 'guided_dialogue':
+          return 'Geführter Dialog';
+        case 'pattern_drill':
+          return 'Mustertraining';
+        case 'real_life_scenario':
+          return 'Alltagsszenario';
+        case 'intensive_review':
+          return 'Wiederholungsphase';
+        case 'checkpoint':
+          return 'Checkpoint';
+        default:
+          return 'Lerneinheit';
+      }
+    },
     editLesson() {
       showInfo(this, 'Die Bearbeitung einzelner Lektionen folgt noch.');
     }
@@ -517,6 +553,42 @@ export default {
   background: rgba(255, 255, 255, 0.7);
 }
 
+.lesson-pedagogy {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 8px;
+}
+
+.lesson-chip {
+  display: inline-flex;
+  align-items: center;
+  padding: 4px 10px;
+  border-radius: 999px;
+  font-size: 0.78rem;
+  font-weight: 700;
+  letter-spacing: 0.02em;
+}
+
+.lesson-chip--phase {
+  background: rgba(120, 195, 138, 0.16);
+  color: #42634e;
+}
+
+.lesson-chip--mode {
+  background: rgba(248, 162, 43, 0.16);
+  color: #8a5411;
+}
+
+.lesson-chip--block {
+  background: rgba(93, 64, 55, 0.09);
+  color: #6d5446;
+}
+
+.lesson-chip--intensive {
+  background: rgba(207, 78, 78, 0.14);
+  color: #a13f3f;
+}
+
 .lesson-card__header {
   display: flex;
   align-items: center;