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>

tsconfig.base.json

@@ -0,0 +1,19 @@
+{
+    "compilerOptions": {
+        "strict": true,
+        "target": "ES2022",
+        "module": "ESNext",
+        "lib": ["ES2022"],
+        "moduleResolution": "bundler",
+        "declaration": true,
+        "declarationMap": true,
+        "sourceMap": true,
+        "outDir": "dist",
+        "rootDir": "src",
+        "resolveJsonModule": true,
+        "forceConsistentCasingInFileNames": true,
+        "skipLibCheck": true,
+        "isolatedModules": true,
+        "esModuleInterop": true
+    }
+}