feat: add DopplerHookMigrator indexer support

[RhizoNymph]

Summary

• Adds indexing support for DopplerHookMigrator pools on mainnet, including the Migrate event handler and ponder config subscription
• Refactors indexer-dhook.ts to remove the commented-out DopplerHookMigrator:Swap handler in favor of PoolManager:Swap which provides authoritative fee data
• Adds linkAssetToDHookMigrationPool in v4pools.ts to hydrate DHook/Rehype migration pools from StateView on all chains
• Fixes initializer comparison logic in DopplerHookInitializer:Create handler
• Fixes multicall failure handling in DopplerHookMigrator:Migrate. Previously failed StateView reads were silently coerced to zero values, which could cause divide by zero when the asset is token1. Now explicitly checks multicall status and bails out with a warning on failure.