feat(bisaya-course): enhance phase 4 didactics with new learning goals and speaking prompts

- Expanded the BISAYA_PHASE4_DIDACTICS by adding new learning goals, core patterns, speaking prompts, and practical tasks to improve language acquisition.
- Updated the course content generation scripts to incorporate the new lesson structures and ensure alignment with the latest didactic updates.
- Enhanced the logic for generating exercises based on lesson types, introducing additional situational and speaking exercises for advanced lessons.

backend/scripts/extend-bisaya-course-phase4.js

@@ -30,6 +30,7 @@ async function extendBisayaCoursePhase4() {
   });
 
   let addedLessons = 0;
+  let updatedLessons = 0;
 
   for (const course of courses) {
     await course.update({
@@ -45,17 +46,9 @@ async function extendBisayaCoursePhase4() {
         }
       });
 
-      if (existing) {
-        continue;
-      }
-
       const didactics = BISAYA_PHASE4_DIDACTICS[lessonData.title] || {};
       const pedagogy = getBisayaLessonPedagogy(lessonData.num) || {};
-
-      await VocabCourseLesson.create({
-        courseId: course.id,
-        chapterId: null,
-        lessonNumber: lessonData.num,
+      const lessonPayload = {
         title: lessonData.title,
         description: lessonData.desc,
         weekNumber: lessonData.week,
@@ -77,6 +70,20 @@ async function extendBisayaCoursePhase4() {
         newUnitTarget: pedagogy.newUnitTarget ?? null,
         reviewWeight: pedagogy.reviewWeight ?? null,
         isIntensiveReview: Boolean(pedagogy.isIntensiveReview)
+      };
+
+      if (existing) {
+        await existing.update(lessonPayload);
+        updatedLessons++;
+        console.log(`🔄 Kurs ${course.id}: Lektion ${lessonData.num} - ${lessonData.title} aktualisiert`);
+        continue;
+      }
+
+      await VocabCourseLesson.create({
+        ...lessonPayload,
+        courseId: course.id,
+        chapterId: null,
+        lessonNumber: lessonData.num
       });
 
       addedLessons++;
@@ -87,6 +94,7 @@ async function extendBisayaCoursePhase4() {
   console.log(`\n🎉 Phase 4 vorbereitet.`);
   console.log(`   Kurse: ${courses.length}`);
   console.log(`   Neue Lektionen ergänzt: ${addedLessons}`);
+  console.log(`   Bestehende Lektionen aktualisiert: ${updatedLessons}`);
   console.log('   Das Einspielen in die DB kann später gesammelt mit den übrigen Phasen erfolgen.');
 }