🔄 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

deno.json

@@ -1,8 +1,11 @@
 {
   "tasks": {
-    "dev": "deno run --allow-read --allow-write --allow-net --allow-ffi --allow-env --env-file --watch index.ts"
+    "dev": "deno run --allow-read --allow-write --allow-net --allow-ffi --allow-env --env-file --watch index.ts",
+    "lint": "biome check",
+    "lint:fix": "biome check --write --unsafe"
   },
   "imports": {
+    "@biomejs/biome": "npm:@biomejs/biome@^1.9.4",
     "@db/sqlite": "jsr:@db/sqlite@^0.12.0",
     "@noble/ciphers": "jsr:@noble/ciphers@^1.2.1",
     "@nostr/tools": "jsr:@nostr/tools@^2.10.4",
@@ -12,13 +15,5 @@
     "@std/fmt": "jsr:@std/fmt@^1.0.4",
     "@std/log": "jsr:@std/log@^0.224.13",
     "@types/deno": "npm:@types/deno@^2.0.0"
-  },
-  "fmt": {
-    "indentWidth": 2,
-    "useTabs": false,
-    "lineWidth": 80,
-    "proseWrap": "always",
-    "semiColons": true,
-    "singleQuote": false
   }
 }