Add language assistant settings and related features: Introduce new routes and controller methods for managing language assistant settings, including retrieval and saving of LLM configurations. Update navigation structure to include language assistant options. Enhance vocab course model to support additional learning attributes such as learning goals and core patterns. Update SQL scripts to reflect new database schema changes for vocab courses. Improve localization for language assistant settings in German and English.

backend/sql/add_vocab_lesson_didactics.sql

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+ALTER TABLE community.vocab_course_lesson
+ADD COLUMN IF NOT EXISTS learning_goals JSONB,
+ADD COLUMN IF NOT EXISTS core_patterns JSONB,
+ADD COLUMN IF NOT EXISTS grammar_focus JSONB,
+ADD COLUMN IF NOT EXISTS speaking_prompts JSONB,
+ADD COLUMN IF NOT EXISTS practical_tasks JSONB;
+
+INSERT INTO community.vocab_grammar_exercise_type (name, description) VALUES
+  ('dialog_completion', 'Dialogergänzung'),
+  ('situational_response', 'Situative Antwort'),
+  ('pattern_drill', 'Muster-Drill'),
+  ('reading_aloud', 'Lautlese-Übung'),
+  ('speaking_from_memory', 'Freies Sprechen')
+ON CONFLICT (name) DO NOTHING;