Add multi-staking entities, APY calculation, Asset Hub indexer support

- Add StakingApy, ActiveStaker, Reward entities to schema.graphql
- Add APY calculation engine in NewEra.ts (inflation curve + validator commission)
- Add saveMultiStakingReward to Rewards.ts and PoolRewards.ts
- Add handleAssetTransfer for assets.Transferred events
- Add constants.ts with genesis hashes and inflation params
- Add docker-compose.prod.yml for production deployment (relay + assethub nodes)
- Add deploy-vps.yml GitHub Actions workflow for auto-deploy on push

schema.graphql

@@ -17,7 +17,7 @@ type AssetTransfer @jsonField {
   success: Boolean!
 }
 
-type Reward @jsonField {
+type RewardInfo @jsonField {
   eventIdx: Int!
   amount: String!
   isReward: Boolean!
@@ -97,7 +97,7 @@ type HistoryElement @entity {
   extrinsicHash: String
   timestamp: BigInt! @index
   address: String! @index
-  reward: Reward
+  reward: RewardInfo
   poolReward: PoolReward
   extrinsic: Extrinsic
   transfer: Transfer
@@ -123,3 +123,30 @@ type ErrorEvent @entity {
   id: ID!
   description: String!
 }
+
+# ===== Multi-staking API entities (used by PezWallet dashboard) =====
+
+type StakingApy @entity {
+  id: ID!
+  networkId: String! @index
+  stakingType: String! @index
+  maxAPY: Float!
+}
+
+type ActiveStaker @entity {
+  id: ID!
+  networkId: String! @index
+  stakingType: String! @index
+  address: String! @index
+}
+
+type Reward @entity {
+  id: ID!
+  networkId: String! @index
+  stakingType: String! @index
+  address: String! @index
+  type: RewardType! @index
+  amount: BigInt!
+  timestamp: BigInt!
+  blockNumber: Int! @index
+}