fix: Migration 029 - activate missing goal types (flexibility, strength)

These goal types existed but were inactive or misconfigured.

Uses UPSERT (INSERT ... ON CONFLICT DO UPDATE):
- If exists → activate + fix labels/icons/category
- If not exists → create properly

Idempotent: Safe to run multiple times, works on dev + prod.

Both types have no automatic data source (source_table = NULL),
so current_value must be updated manually.

Fixes: flexibility and strength goals not visible in admin

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

backend/migrations/029_fix_missing_goal_types.sql

@@ -0,0 +1,74 @@
+-- Migration 029: Fix Missing Goal Types (flexibility, strength)
+-- Date: 2026-03-27
+-- Purpose: Ensure flexibility and strength goal types are active and properly configured
+
+-- These types were created earlier but are inactive or misconfigured
+-- This migration fixes them without breaking if they don't exist
+
+-- ============================================================================
+-- Upsert flexibility goal type
+-- ============================================================================
+
+INSERT INTO goal_type_definitions (
+    type_key, label_de, label_en, unit, icon, category,
+    source_table, source_column, aggregation_method,
+    calculation_formula, filter_conditions, description, is_active
+) VALUES (
+    'flexibility',
+    'Beweglichkeit',
+    'Flexibility',
+    'cm',
+    '🤸',
+    'training',
+    NULL,  -- No automatic data source
+    NULL,
+    'latest',
+    NULL,
+    NULL,
+    'Beweglichkeit und Mobilität - manuelle Erfassung',
+    true
+)
+ON CONFLICT (type_key)
+DO UPDATE SET
+    label_de = 'Beweglichkeit',
+    label_en = 'Flexibility',
+    unit = 'cm',
+    icon = '🤸',
+    category = 'training',
+    is_active = true,
+    description = 'Beweglichkeit und Mobilität - manuelle Erfassung';
+
+-- ============================================================================
+-- Upsert strength goal type
+-- ============================================================================
+
+INSERT INTO goal_type_definitions (
+    type_key, label_de, label_en, unit, icon, category,
+    source_table, source_column, aggregation_method,
+    calculation_formula, filter_conditions, description, is_active
+) VALUES (
+    'strength',
+    'Kraftniveau',
+    'Strength',
+    'Punkte',
+    '💪',
+    'training',
+    NULL,  -- No automatic data source
+    NULL,
+    'latest',
+    NULL,
+    NULL,
+    'Allgemeines Kraftniveau - manuelle Erfassung',
+    true
+)
+ON CONFLICT (type_key)
+DO UPDATE SET
+    label_de = 'Kraftniveau',
+    label_en = 'Strength',
+    unit = 'Punkte',
+    icon = '💪',
+    category = 'training',
+    is_active = true,
+    description = 'Allgemeines Kraftniveau - manuelle Erfassung';
+
+COMMENT ON TABLE goal_type_definitions IS 'Goal type registry - defines all available goal types (v1.5: DB-driven, flexible system)';