fix: correct GraphQL query syntax in DataLoader for network subgraph

- Replace invalid OR filter with proper id_in syntax for batch queries
- Fix indexer_in filter for allocations by indexer queries
- Add AllocationStatus enum parameter for status filtering
- Implement consistent error handling with BatchLoadError and QueryExecutionError
- Add proper disposal pattern and cache priming methods
- Extract magic numbers into DATALOADER_DEFAULTS constants

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Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: DaMandal0rian