feat(P0-001): scaffold monorepo structure (#60)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

packages/auth/package.json

@@ -0,0 +1,22 @@
+{
+  "name": "@mosaic/auth",
+  "version": "0.0.0",
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "default": "./dist/index.js"
+    }
+  },
+  "scripts": {
+    "build": "tsc",
+    "lint": "eslint src",
+    "typecheck": "tsc --noEmit",
+    "test": "vitest run"
+  },
+  "devDependencies": {
+    "typescript": "^5.8.0",
+    "vitest": "^2.0.0"
+  }
+}