chore: initial monorepo scaffold

Setup pnpm workspaces with apps/{web,api} placeholders and shared
packages: tsconfig, eslint-config, shared, ui, db. Includes Prettier,
ESLint, Husky pre-commit, lint-staged, EditorConfig, VSCode settings.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/eslint-config/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "@ketopath/eslint-config",
+  "version": "0.0.0",
+  "private": true,
+  "main": "index.cjs",
+  "files": [
+    "index.cjs",
+    "nextjs.cjs",
+    "node.cjs"
+  ],
+  "peerDependencies": {
+    "eslint": "^8.57.0"
+  }
+}