[indexer]: index yield vaults to track LP yields

[royvardhan]

Closes #1001

Indexes the supported ERC-4626 yield vaults so LP yields running simplex can be tracked:

• Deposit / Withdraw events (redeem emits Withdraw) per vault → VaultLedgerEvent audit trail and a running VaultLpPosition (net principal per LP).
• A daily block-handler snapshot prices each LP's live share balance into assets via convertToAssets(balanceOf(lp)) → VaultPositionSnapshot (with yieldEarned), plus a vault-level VaultSnapshot (totalAssets / totalShares / assetsPerShare).

Datasources are generated per configured vault from the existing yieldVaults config; snapshots dedupe per UTC day. Generic over any ERC-4626 vault, so it also covers our own StreamingYieldVault.

[Wizdave97]

@royvardhan recordLedger drops the event whenever lp isn't already a LiquidityProvider, but those rows are created only by the Hyperbridge phantom handler (a different chain / subql node), so there's no ordering guarantee against these EVM vault events. If a solver deposits before its first phantom bid is indexed, the Deposit is skipped and never backfilled — totalAssetsDeposited is left too low, and since the daily snapshot prices the live balanceOf (which already includes those shares), yieldEarned = assetValue - netPrincipal ends up overstated by the dropped principal, for exactly the LPs this is meant to track.

As a backup when the LiquidityProvider lookup misses, check whether lp is delegated to the our solver accounts before dropping the event — treat a delegated account as ours, so its vault activity is still tracked even before (or without) a LiquidityProvider row.