refactor: move brother_node development artifact to dev/test-nodes subdirectory

Development Artifact Cleanup:
✅ BROTHER_NODE REORGANIZATION: Moved development test node to appropriate location
- dev/test-nodes/brother_node/: Moved from root directory for better organization
- Contains development configuration, test logs, and test chain data
- No impact on production systems - purely development/testing artifact

✅ DEVELOPMENT ARTIFACTS IDENTIFIED:
- Chain ID: aitbc-brother-chain (test/development chain)
- Ports: 8010 (P2P) and 8011 (RPC) - different from production
- Environment: .env file with test configuration
- Logs: rpc.log and node.log from development testing session (March 15, 2026)

✅ ROOT DIRECTORY CLEANUP: Removed development clutter from production directory
- brother_node/ moved to dev/test-nodes/brother_node/
- Root directory now contains only production-ready components
- Development artifacts properly organized in dev/ subdirectory

DIRECTORY STRUCTURE IMPROVEMENT:
📁 dev/test-nodes/: Development and testing node configurations
🏗️ Root Directory: Clean production structure with only essential components
🧪 Development Isolation: Test environments separated from production

BENEFITS:
✅ Clean Production Directory: No development artifacts in root
✅ Better Organization: Development nodes grouped in dev/ subdirectory
✅ Clear Separation: Production vs development environments clearly distinguished
✅ Maintainability: Easier to identify and manage development components

RESULT: Successfully moved brother_node development artifact to dev/test-nodes/ subdirectory, cleaning up the root directory while preserving development testing environment for future use.

dev/env/node_modules/ethers/lib.commonjs/utils/base64.js

@@ -0,0 +1,58 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.encodeBase64 = exports.decodeBase64 = void 0;
+/**
+ *  [Base64 encoding](link-wiki-base64) using 6-bit words to encode
+ *  arbitrary bytes into a string using 65 printable symbols, the
+ *  upper-case and lower-case alphabet, the digits ``0`` through ``9``,
+ *  ``"+"`` and ``"/"`` with the ``"="`` used for padding.
+ *
+ *  @_subsection: api/utils:Base64 Encoding  [about-base64]
+ */
+const data_js_1 = require("./data.js");
+/**
+ *  Decodes the base-64 encoded %%value%%.
+ *
+ *  @example:
+ *    // The decoded value is always binary data...
+ *    result = decodeBase64("SGVsbG8gV29ybGQhIQ==")
+ *    //_result:
+ *
+ *    // ...use toUtf8String to convert it to a string.
+ *    toUtf8String(result)
+ *    //_result:
+ *
+ *    // Decoding binary data
+ *    decodeBase64("EjQ=")
+ *    //_result:
+ */
+function decodeBase64(value) {
+    return (0, data_js_1.getBytesCopy)(Buffer.from(value, "base64"));
+}
+exports.decodeBase64 = decodeBase64;
+;
+/**
+ *  Encodes %%data%% as a base-64 encoded string.
+ *
+ *  @example:
+ *    // Encoding binary data as a hexstring
+ *    encodeBase64("0x1234")
+ *    //_result:
+ *
+ *    // Encoding binary data as a Uint8Array
+ *    encodeBase64(new Uint8Array([ 0x12, 0x34 ]))
+ *    //_result:
+ *
+ *    // The input MUST be data...
+ *    encodeBase64("Hello World!!")
+ *    //_error:
+ *
+ *    // ...use toUtf8Bytes for this.
+ *    encodeBase64(toUtf8Bytes("Hello World!!"))
+ *    //_result:
+ */
+function encodeBase64(data) {
+    return Buffer.from((0, data_js_1.getBytes)(data)).toString("base64");
+}
+exports.encodeBase64 = encodeBase64;
+//# sourceMappingURL=base64.js.map