feat(academy): bridge Academy with Training Engine for course generation

- Add POST /academy/courses/generate endpoint that creates an academy
  course from a training module (with content + quiz as lessons)
- Add POST /academy/courses/generate-all to bulk-generate all courses
- Fix academy API response mapping (snake_case → camelCase)
- Fix fetchCourses/fetchCourse/fetchEnrollments/fetchStats to unwrap
  backend response wrappers ({courses:[...]}, {course:{...}})
- Add "Alle Kurse generieren" button to academy overview page
- Fix bulkResult.errors crash in training page (optional chaining)
- Add SetAcademyCourseID to training store for bidirectional linking

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ai-compliance-sdk/internal/training/store.go

@@ -235,6 +235,14 @@ func (s *Store) UpdateModule(ctx context.Context, module *TrainingModule) error
 	return err
 }
 
+// SetAcademyCourseID links a training module to an academy course
+func (s *Store) SetAcademyCourseID(ctx context.Context, moduleID, courseID uuid.UUID) error {
+	_, err := s.pool.Exec(ctx, `
+		UPDATE training_modules SET academy_course_id = $2, updated_at = $3 WHERE id = $1
+	`, moduleID, courseID, time.Now().UTC())
+	return err
+}
+
 // ============================================================================
 // Matrix Operations
 // ============================================================================