chore: add biome.json as an alternative to Prettier and ESLint

For developers who prefer Biome, this config mirrors the existing
.prettierrc rules (single quotes, no trailing commas) and ESLint rules
(recommended rules, no-console as error, import sorting via assist).

This is not a replacement — Prettier and ESLint remain the primary
tooling. biome.json is an opt-in for those who already use Biome.

Author: SOV710

biome.json

@@ -0,0 +1,52 @@
+{
+  "$schema": "https://biomejs.dev/schemas/2.4.10/schema.json",
+
+  "vcs": {
+    "enabled": true,
+    "clientKind": "git",
+    "useIgnoreFile": true
+  },
+
+  "files": {
+    "ignoreUnknown": true,
+    "includes": ["**", "!!build", "!!dist", "!!out"]
+  },
+
+  "formatter": {
+    "enabled": true,
+    "indentStyle": "space",
+    "indentWidth": 2,
+    "lineEnding": "lf"
+  },
+
+  "javascript": {
+    "formatter": {
+      "quoteStyle": "single",
+      "jsxQuoteStyle": "double",
+      "trailingCommas": "none",
+      "semicolons": "always"
+    }
+  },
+
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "recommended": true,
+      "suspicious": {
+        "noConsole": "error"
+      },
+      "style": {
+        "noNonNullAssertion": "off"
+      }
+    }
+  },
+
+  "assist": {
+    "enabled": true,
+    "actions": {
+      "source": {
+        "organizeImports": "on"
+      }
+    }
+  }
+}