feat(bisaya-course): restructure core patterns and enhance vocabulary preparation

- Updated core patterns in various scripts to use an object format with target phrases and glosses, improving clarity and usability for learners.
- Enhanced the VocabService to normalize core pattern entries, ensuring consistent handling of vocabulary data.
- Introduced new vocabulary preparation steps in the VocabLessonView, guiding users through active review processes before engaging with the vocabulary trainer.
- Added localization support for new vocabulary preparation hints and instructions in multiple languages, enhancing user experience across the application.

frontend/src/i18n/locales/en/socialnetwork.json

@@ -447,6 +447,14 @@
                 "grammarImpulse": "Grammar Focus",
                 "learningGoals": "Learning Goals",
                 "corePatterns": "Core Patterns",
+                "corePatternsHint": "Read the target language first, then the meaning below — you learn each pattern both ways.",
+                "vocabPrepTitle": "Preparation before the vocabulary trainer",
+                "vocabPrepStep1": "Read through core patterns and the word list (native language ↔ target language) once.",
+                "vocabPrepConfirm1": "First pass done",
+                "vocabPrepStep2": "Go through the same items again (active review, not testing yet).",
+                "vocabPrepConfirm2": "Second pass done",
+                "vocabPrepReady": "You can start the vocabulary trainer now.",
+                "vocabTrainerLockedHint": "Please confirm two preparation steps under “Preparation before the vocabulary trainer” first.",
                 "speakingTasks": "Speaking Tasks",
                 "speakingPrompt": "Speaking Prompt",
                 "practicalTasks": "Practical Tasks",