fix(all): complete activity calendars, shop purchases and reward dispatch

Restore event and mini hubs, current shop and hunt calendars, and regular seasons; preserve all published windows. Implement story/quiz routes, native shop purchases, avatar sets, currencies, rank-change items and permanent buffs with rollback and reward coverage tests. Refresh client buff stats and update Cash Shop to 0.1.1.

go/cmd/bd2server/main.go

@@ -732,6 +732,21 @@ func serve(args []string) (serveErr error) {
 		return fmt.Errorf("load event inventory design: %w", err)
 	}
 	eventEconomy.AttachOwnedItemDesign(ownedEventItems)
+	avatarRewards, err := gamedata.LoadAvatarRewardDesign(gameData, *gameDataVersion)
+	if err != nil {
+		return fmt.Errorf("load avatar rewards: %w", err)
+	}
+	eventEconomy.AttachAvatarRewards(avatarRewards)
+	buffDesign, err := gamedata.LoadBuffRewardDesign(gameData, *gameDataVersion)
+	if err != nil {
+		return fmt.Errorf("load permanent buff rewards: %w", err)
+	}
+	buffRewards, err := events.OpenBuffRewards(gameplayStore, buffDesign)
+	if err != nil {
+		return fmt.Errorf("load permanent buff ownership: %w", err)
+	}
+	eventEconomy.AttachBuffRewards(buffRewards)
+	pictorialService.AttachPermanentBuffs(buffRewards.SnapshotBuffs)
 	eventAPCaps, eventAPReset, err := gamedata.LoadEventAPDesign(gameData, *gameDataVersion)
 	if err != nil {
 		return fmt.Errorf("load event AP reset: %w", err)
@@ -786,6 +801,9 @@ func serve(args []string) (serveErr error) {
 	if err := cashService.AttachShopSeed(serverConfig); err != nil {
 		return fmt.Errorf("attach cash product availability: %w", err)
 	}
+	if err := cashService.AttachEventShopSchedules(cashDesign, calendars.Events); err != nil {
+		return fmt.Errorf("attach event shop availability: %w", err)
+	}
 	cashBonusDesign, err := gamedata.LoadCashBonusCatalog(gameData, *gameDataVersion)
 	if err != nil {
 		return fmt.Errorf("load cash bonus design: %w", err)
@@ -910,6 +928,13 @@ func serve(args []string) (serveErr error) {
 	if err != nil {
 		return fmt.Errorf("load event action state: %w", err)
 	}
+	miniContent, err := gamedata.LoadMiniContentDesign(gameData, *gameDataVersion)
+	if err != nil {
+		return fmt.Errorf("load mini event content: %w", err)
+	}
+	if err = eventActionsService.AttachMiniContent(eventPlayService, miniContent); err != nil {
+		return fmt.Errorf("attach mini event content: %w", err)
+	}
 	eventActionsService.AttachFriendshipLevel(func(id uint64) uint64 {
 		for _, entry := range collection.FriendshipEntries() {
 			if entry.State != nil && entry.State.CostumeID == id {