fix: Include start_value in get_active_goals query

Goal progress placeholders were filtering out all goals because
start_value was missing from the SELECT statement.

Added start_value to both:
- get_active_goals() - for placeholder formatters
- get_goal_by_id() - for consistency

This will fix:
- active_goals_md progress column (was all "-")
- top_3_goals_behind_schedule (was "keine Ziele")
- top_3_goals_on_track (was "keine Ziele")

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

backend/goal_utils.py

@@ -542,7 +542,7 @@ def get_active_goals(profile_id: str) -> List[Dict]:
         cur = get_cursor(conn)
         cur.execute("""
             SELECT id, goal_type, name, target_value, target_date,
-                   current_value, progress_pct, status, is_primary
+                   current_value, start_value, progress_pct, status, is_primary
             FROM goals
             WHERE profile_id = %s
               AND status IN ('active', 'in_progress')
@@ -558,7 +558,7 @@ def get_goal_by_id(goal_id: str) -> Optional[Dict]:
         cur = get_cursor(conn)
         cur.execute("""
             SELECT id, profile_id, goal_type, target_value, target_date,
-                   current_value, progress_pct, status, is_primary
+                   current_value, start_value, progress_pct, status, is_primary
             FROM goals
             WHERE id = %s
         """, (goal_id,))