fix(subquery): bump startBlocks past pruning window

Both governance and AH indexers were crashing at pruned blocks (RPC
nodes only retain last ~256 blocks of state). Bumping startBlock to
near-tip allows clean indexing forward from current state.

- governance: 57100 → 1228500 (relay tip - ~200)
- AH: 582592 → 1029200 (AH tip - ~200)

Loss: governance 57100-1228500 (mostly empty, pre-governance-activity);
AH 582592-1029200 (~410k blocks of staking/transfer data — postgres
state will be dropped, accept loss).

Long-term fix: provision Asset Hub archive node so reindexing from
genesis is possible without recurring pruning issues.

pezkuwi-assethub.yaml

@@ -19,7 +19,7 @@ network:
 dataSources:
   - name: main
     kind: substrate/Runtime
-    startBlock: 582592
+    startBlock: 1029200
     mapping:
       file: ./dist/index.js
       handlers:

pezkuwi-governance.yaml

@@ -22,7 +22,7 @@ network:
 dataSources:
   - name: governance
     kind: substrate/Runtime
-    startBlock: 57100
+    startBlock: 1228500
     mapping:
       file: ./dist/index.js
       handlers: