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-browser.js

@@ -0,0 +1,24 @@
+"use strict";
+// utils/base64-browser
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.encodeBase64 = exports.decodeBase64 = void 0;
+const data_js_1 = require("./data.js");
+function decodeBase64(textData) {
+    textData = atob(textData);
+    const data = new Uint8Array(textData.length);
+    for (let i = 0; i < textData.length; i++) {
+        data[i] = textData.charCodeAt(i);
+    }
+    return (0, data_js_1.getBytes)(data);
+}
+exports.decodeBase64 = decodeBase64;
+function encodeBase64(_data) {
+    const data = (0, data_js_1.getBytes)(_data);
+    let textData = "";
+    for (let i = 0; i < data.length; i++) {
+        textData += String.fromCharCode(data[i]);
+    }
+    return btoa(textData);
+}
+exports.encodeBase64 = encodeBase64;
+//# sourceMappingURL=base64-browser.js.map