feat: add extended training types (cardio walk/dance, mind & meditation)

- Migration 005: Add cardio subcategories (Gehen, Tanzen)
- Migration 005: Add new category "Geist & Meditation" with 4 subcategories
  (Meditation, Atemarbeit, Achtsamkeit, Visualisierung)
- Update categories endpoint with mind category metadata
- Update Apple Health mapping: dance → dance, add meditation/mindfulness
- 6 new training types total

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

backend/migrations/005_training_types_extended.sql

@@ -0,0 +1,24 @@
+-- Migration 005: Extended Training Types
+-- Add: Cardio (Gehen, Tanzen), Mind & Meditation category
+-- Created: 2026-03-21
+
+-- ========================================
+-- Add new cardio subcategories
+-- ========================================
+INSERT INTO training_types (category, subcategory, name_de, name_en, icon, sort_order) VALUES
+  ('cardio', 'walk',        'Gehen',            'Walking',          '🚶', 105),
+  ('cardio', 'dance',       'Tanzen',           'Dance',            '💃', 106);
+
+-- ========================================
+-- Add new category: Geist & Meditation
+-- ========================================
+INSERT INTO training_types (category, subcategory, name_de, name_en, icon, sort_order) VALUES
+  ('mind', 'meditation',    'Meditation',       'Meditation',       '🧘‍♂️', 700),
+  ('mind', 'breathwork',    'Atemarbeit',       'Breathwork',       '🫁', 701),
+  ('mind', 'mindfulness',   'Achtsamkeit',      'Mindfulness',      '☮️', 702),
+  ('mind', 'visualization', 'Visualisierung',   'Visualization',    '🎨', 703);
+
+-- ========================================
+-- Add comment
+-- ========================================
+COMMENT ON TABLE training_types IS 'v9d Phase 1b: Extended with cardio walk/dance and mind category';

backend/routers/activity.py

@@ -135,10 +135,12 @@ def get_training_type_for_apple_health(workout_type: str):
             'martial arts': 'technique',
             'boxing': 'sparring',
             'rowing': 'rowing',
-            'dance': 'other',
+            'dance': 'dance',
             'core training': 'functional',
             'flexibility': 'static',
             'cooldown': 'regeneration',
+            'meditation': 'meditation',
+            'mindfulness': 'mindfulness',
         }
 
         subcategory = mapping.get(workout_type.lower())

backend/routers/training_types.py

@@ -113,6 +113,12 @@ def list_categories(session: dict = Depends(require_auth)):
             'icon': '💆',
             'color': '#6B7280'
         },
+        'mind': {
+            'name_de': 'Geist & Meditation',
+            'name_en': 'Mind & Meditation',
+            'icon': '🧘‍♂️',
+            'color': '#A78BFA'
+        },
         'other': {
             'name_de': 'Sonstiges',
             'name_en': 'Other',