feat(WHE-27): add drizzle db package and typed env config

packages/config/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "@household/config",
+  "private": true,
+  "type": "module",
+  "exports": {
+    ".": "./src/index.ts"
+  },
+  "scripts": {
+    "build": "bun build src/index.ts --outdir dist --target bun",
+    "typecheck": "tsgo --project tsconfig.json --noEmit",
+    "test": "bun test --pass-with-no-tests",
+    "lint": "oxlint \"src\""
+  },
+  "dependencies": {
+    "@t3-oss/env-core": "^0.13.8",
+    "zod": "^4.1.5"
+  }
+}