feat(docs): add direct minting prefix detailed info and event (#1332)

Author: fassko

docs/fassets/03-direct-minting.mdx

@@ -45,7 +45,9 @@ There are two supported formats:
 
 **32-byte memo** (recipient only):
 
-A standard direct minting payment reference that encodes only the 20-byte recipient address.
+1. **8-byte prefix**: `0x4642505266410018` (`DIRECT_MINTING`)
+2. **20-byte recipient address**
+
 Anyone can execute, as no executor is specified.
 
 **48-byte memo** (recipient and executor):

docs/fassets/reference/IAssetManagerEvents.mdx

@@ -7,7 +7,7 @@ sidebar_position: 3
 
 `IAssetManagerEvents` is an interface that defines the events emitted by the [`IAssetManager`](/fassets/reference/IAssetManager) contract.
 
-Sourced from `IAssetManagerEvents.sol` on [GitHub](https://github.com/flare-foundation/fassets/blob/main/contracts/userInterfaces/IAssetManagerEvents.sol).ā
+Sourced from `IAssetManagerEvents.sol` on [GitHub](https://github.com/flare-foundation/fassets/blob/main/contracts/userInterfaces/IAssetManagerEvents.sol).
 
 ## Event Categories
 
@@ -118,6 +118,30 @@ event MintingExecuted(
 );
 ```
 
+### `DirectMintingExecuted`
+
+Emitted when a direct minting payment is confirmed and FAssets are minted to the target address.
+
+Parameters:
+
+- `transactionId`: Identifier of the direct minting transaction
+- `targetAddress`: Address that receives the minted FAssets
+- `executor`: Address of the executor that submitted the minting proof
+- `mintedAmountUBA`: Amount of FAssets minted in the underlying base amount
+- `mintingFeeUBA`: Minting fee in the underlying base amount
+- `executorFeeUBA`: Fee paid to the executor in the underlying base amount
+
+```solidity
+event DirectMintingExecuted(
+    bytes32 transactionId,
+    address targetAddress,
+    address executor,
+    uint256 mintedAmountUBA,
+    uint256 mintingFeeUBA,
+    uint256 executorFeeUBA
+);
+```
+
 ### `MintingPaymentDefault`
 
 Emitted when a minter fails to pay the underlying funds in time.