fix: show all tiers in admin matrix editor including selfhosted

- Remove active=true filter - admins need to configure all tiers
- Add reset_period to features query for frontend display

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

backend/routers/tier_limits.py

@@ -29,13 +29,13 @@ def get_tier_limits_matrix(session: dict = Depends(require_admin)):
     with get_db() as conn:
         cur = get_cursor(conn)
 
-        # Get all tiers
-        cur.execute("SELECT id, name, sort_order FROM tiers WHERE active = true ORDER BY sort_order")
+        # Get all tiers (including inactive - admin needs to configure all)
+        cur.execute("SELECT id, name, sort_order FROM tiers ORDER BY sort_order")
         tiers = [r2d(r) for r in cur.fetchall()]
 
         # Get all features
         cur.execute("""
-            SELECT id, name, category, limit_type, default_limit
+            SELECT id, name, category, limit_type, default_limit, reset_period
             FROM features
             WHERE active = true
             ORDER BY category, name