Remove relay staking handlers after pallet removal (spec 1_020_006)

Staking pallet (index 9), FastUnstake (15), and VoterBagsList (100)
were removed from the relay chain. The relay indexer now only tracks
transfers and signed extrinsics. Added safety try-catch to staking
queries in case handlers are accidentally re-enabled.

pezkuwi.yaml

@@ -8,7 +8,7 @@ runner:
   query:
     name: "@subql/query"
     version: "*"
-description: Pezkuwi Staking SubQuery - Indexes staking rewards, slashes, era data for PezWallet
+description: Pezkuwi Relay SubQuery - Indexes transfer history and governance-related data
 repository: https://github.com/pezkuwichain/pezkuwi-subquery
 schema:
   file: ./schema.graphql
@@ -26,71 +26,14 @@ dataSources:
     mapping:
       file: ./dist/index.js
       handlers:
-        # Block handler: initialize active relay stakers from chain state
-        - handler: handleRelayBlock
-          kind: substrate/BlockHandler
         # Signed extrinsics for history
         - handler: handleHistoryElement
           kind: substrate/CallHandler
           filter:
             isSigned: true
-        # Staking rewards (old format)
-        - handler: handleReward
-          kind: substrate/EventHandler
-          filter:
-            module: staking
-            method: Reward
-        # Staking rewards (new format - Polkadot 2.0)
-        - handler: handleRewarded
-          kind: substrate/EventHandler
-          filter:
-            module: staking
-            method: Rewarded
-        # Nomination Pools rewards
-        - handler: handlePoolReward
-          kind: substrate/EventHandler
-          filter:
-            module: nominationPools
-            method: PaidOut
-        # Slashing (old format)
-        - handler: handleSlash
-          kind: substrate/EventHandler
-          filter:
-            module: staking
-            method: Slash
-        # Slashing (new format)
-        - handler: handleSlashed
-          kind: substrate/EventHandler
-          filter:
-            module: staking
-            method: Slashed
-        # Pool bonded slash
-        - handler: handlePoolBondedSlash
-          kind: substrate/EventHandler
-          filter:
-            module: nominationPools
-            method: PoolSlashed
-        # Pool unbonding slash
-        - handler: handlePoolUnbondingSlash
-          kind: substrate/EventHandler
-          filter:
-            module: nominationPools
-            method: UnbondingPoolSlashed
         # Transfers
         - handler: handleTransfer
           kind: substrate/EventHandler
           filter:
             module: balances
             method: Transfer
-        # Era changes (old format)
-        - handler: handleNewEra
-          kind: substrate/EventHandler
-          filter:
-            module: staking
-            method: StakingElection
-        # Era changes (new format - Polkadot 2.0)
-        - handler: handleStakersElected
-          kind: substrate/EventHandler
-          filter:
-            module: staking
-            method: StakersElected