🔄 Synchronize Biome linting rules between relay and frontend

🛠️ Apply identical Biome configuration from frontend to relay service
🧹 Ensure consistent code formatting and quality standards across components
📝 Maintain unified development experience throughout the project

biome.json

@@ -0,0 +1,44 @@
+{
+  "$schema": "https://biomejs.dev/schemas/1.9.4/schema.json",
+  "files": {
+    "include": ["index.ts", "**/*.ts"]
+  },
+  "vcs": {
+    "enabled": true,
+    "clientKind": "git",
+    "useIgnoreFile": true
+  },
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "style": {
+        "noNonNullAssertion": "off",
+        "useNodejsImportProtocol": "warn"
+      },
+      "complexity": {
+        "useLiteralKeys": "off"
+      }
+    }
+  },
+  "formatter": {
+    "enabled": true,
+    "formatWithErrors": true,
+    "ignore": [],
+    "attributePosition": "auto",
+    "indentStyle": "space",
+    "indentWidth": 2,
+    "lineWidth": 80,
+    "lineEnding": "lf"
+  },
+  "javascript": {
+    "formatter": {
+      "arrowParentheses": "always",
+      "bracketSameLine": true,
+      "bracketSpacing": true,
+      "quoteStyle": "single",
+      "quoteProperties": "asNeeded",
+      "semicolons": "always",
+      "trailingCommas": "all"
+    }
+  }
+}