chore: release version 2.3.5 and refactor lobby

Bump export_presets.cfg version to 2.3.5. Update CHANGELOG_DRAFT.md.
Refactor lobby.gd into LobbyChat, LobbyMainMenu, LobbyRoomList, LobbyRoom.
Move Nakama config to environment variables in nakama_manager.gd.
Derive auth_manager.gd encryption key from OS.get_unique_id().sha256_text().
Remove Steam email auth fallback. Require auth ticket.
Make GachaManager.pull() async in gacha_panel.gd.
Remove dummy wallet seeding. Add store_type to IAP payload.
Validate IAP receipts server-side in economy.lua.
Register gacha module in main.lua.
Clean backend_service.gd stubs.
Fix featured_banners type safety in gacha_manager.gd. Guards non-array responses.
Move tiles_armagedon_a1.res to assets/models/meshes/. Fix import fallback_path.

scripts/managers/gacha_manager.gd

@@ -27,44 +27,44 @@ func _load_data() -> void:
 
 func pull(banner_id: String, count: int) -> Array:
 	if data.is_empty(): _load_data()
-	var banner: Dictionary = data.get("banners", {}).get(banner_id, {})
-	if banner.is_empty():
-		push_error("[GachaManager] Unknown banner: " + banner_id)
+	
+	if not NakamaManager.session:
+		push_error("[GachaManager] Not authenticated")
 		return []
 
-	var currency: String  = banner.get("currency", "star")
-	var cost_key: String  = "pull_%d_cost" % count
-	var cost: int         = banner.get(cost_key, banner.get("pull_1_cost", 999) * count)
-	var pity_at: int      = banner.get("pity_at", 90)
-
-	# Deduct currency
-	var bal: int = UserProfileManager.wallet.get(currency, 0)
-	if bal < cost:
-		push_warning("[GachaManager] Not enough %s (have %d need %d)" % [currency, bal, cost])
+	var payload = JSON.stringify({
+		"banner_id": banner_id,
+		"count": count
+	})
+	
+	var result = await NakamaManager.client.rpc_async(
+		NakamaManager.session,
+		"perform_gacha_pull",
+		payload
+	)
+	
+	if result.is_exception():
+		var msg = result.get_exception().message
+		push_error("[GachaManager] Gacha pull failed: " + msg)
 		return []
-	UserProfileManager.wallet[currency] = bal - cost
-	UserProfileManager.save_wallet()
-
-	var results: Array = []
-	for _i in range(count):
-		var pity: int = pity_counters.get(banner_id, 0)
-		var rarity: String
-		if pity + 1 >= pity_at:
-			rarity = "real_prize"
-			pity_counters[banner_id] = 0
-		else:
-			rarity = _roll_rarity(banner.get("rates", {}))
-			pity_counters[banner_id] = (pity + 1) if rarity != "real_prize" else 0
-
-		var item_id: String = _pick_from_pool(rarity, banner_id)
-		var item_data: Dictionary = _resolve_item(item_id, rarity)
-		results.append({
-			"id":     item_id,
-			"rarity": rarity,
-			"name":   item_data.get("name", item_id)
-		})
+		
+	var parsed = JSON.parse_string(result.payload)
+	if typeof(parsed) != TYPE_DICTIONARY or not parsed.has("results"):
+		return []
+		
+	var results: Array = parsed.get("results", [])
+	
+	if parsed.has("new_pity"):
+		pity_counters[banner_id] = int(parsed.new_pity)
+	
+	if UserProfileManager.has_method("_reload_wallet"):
+		await UserProfileManager._reload_wallet()
+	
+	for res in results:
+		var item_id = res.get("id", "")
+		var rarity = res.get("rarity", "")
 		_grant_item(item_id, rarity)
-
+	
 	pull_completed.emit(results)
 	return results