feat(server): add special loot and data-driven gameplay rules

Generate equipment loot atomically, grant random boxes and prevent repeat claims.
Read gacha pools, pity, products, tickets, missions, presets, chapter rewards
and inventory costs from GameData; extend both collaboration UR ticket pools.
Sync owned recipes, configure startup state and calendars in versioned seeds,
and validate unlock tickets and revival talents.

go/internal/server/world/pack_jam.go

@@ -41,7 +41,7 @@ func (s *Service) handlePackDocking(path string, request []byte) (int, []byte, b
 		return 72, nil, true, nil
 	}
 	reward := s.packJamDesign.Reward
-	if reward.Type != 3 || reward.ID != 0 || reward.Count == 0 || reward.Count > uint64(^uint32(0)>>1) {
+	if s.packJamDesign.ValidateReward() != nil {
 		return 0, nil, true, fmt.Errorf("world: unsupported pack jam reward")
 	}
 	if _, err := s.wallet.GrantQuestOnce(identity, []gamedata.Reward{reward}); err != nil {