feat: initial dev-configs monorepo

Shared configs for TypeScript projects: ESLint, Prettier, TypeScript,
Vite, Jest, Playwright, Knip. Published as @vigdorov/* npm packages
to Gitea registry.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/prettier/package.json

@@ -0,0 +1,19 @@
+{
+    "name": "@vigdorov/prettier-config",
+    "version": "1.0.0",
+    "description": "Shared Prettier configuration",
+    "type": "module",
+    "main": "dist/index.js",
+    "types": "dist/index.d.ts",
+    "files": ["dist"],
+    "scripts": {
+        "build": "tsc"
+    },
+    "peerDependencies": {
+        "prettier": ">=3.0.0"
+    },
+    "devDependencies": {
+        "prettier": "^3.5.3",
+        "typescript": "^5.8.3"
+    }
+}