feat: auto-mint ERC-4626 vault shares as collateral

[starksama]

Summary

For markets where collateral is an ERC-4626 vault token, allow users to deposit the underlying asset and auto-mint vault shares in one flow — instead of manually minting shares first, then supplying as collateral.

Example

Market: vault-USDC (collateral) / USDC (loan)

• User has USDC
• Monarch auto-deposits USDC into the vault, mints shares, then supplies shares as collateral
• No need to interact with the vault contract separately

Requirements

• Detect markets where collateral is an ERC-4626 vault
• Resolve the vault's underlying asset
• Allow input in underlying asset terms (e.g. USDC) instead of vault shares
• Bundle: deposit underlying → mint shares → supply as collateral (via Morpho bundler)
• Works standalone and combined with leverage looping (feat: leverage looping for borrowers #354)

Context

User request from institutional user — manual minting + approval flow is especially painful with multisig wallets.

[antoncoding]

closed by #415