chore: update DBIS contracts and integrate EIP-712 helper

- Updated DBIS_ConversionRouter and DBIS_SettlementRouter to utilize IDBIS_EIP712Helper for EIP-712 hashing and signature recovery, improving stack depth management.
- Refactored minting logic in DBIS_GRU_MintController to streamline recipient processing.
- Enhanced BUILD_NOTES.md with updated build instructions and test coverage details.
- Added new functions in DBIS_SignerRegistry for duplicate signer checks and active signer validation.
- Introduced a new submodule, DBIS_EIP712Helper, to encapsulate EIP-712 related functionalities.

Made-with: Cursor

services/token-aggregation/src/utils/iso4217-symbol-validator.ts

@@ -5,9 +5,6 @@
  */
 
 import {
-  FIN_CHAIN_SET,
-  ISO4217_SUPPORTED,
-  ASSET_TYPE_SET,
   V0_TO_V1_SYMBOL_MAP,
   isFinChainDesignator,
   isISO4217Supported,

services/token-aggregation/src/utils/logger.ts

@@ -0,0 +1,18 @@
+import winston from 'winston';
+
+export const logger = winston.createLogger({
+  level: process.env.LOG_LEVEL || 'info',
+  format: winston.format.combine(
+    winston.format.timestamp(),
+    winston.format.errors({ stack: true }),
+    winston.format.json()
+  ),
+  transports: [
+    new winston.transports.Console({
+      format: winston.format.combine(
+        winston.format.colorize(),
+        winston.format.simple()
+      ),
+    }),
+  ],
+});