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"
+  }
+}

packages/config/src/env.ts

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+import { createEnv } from '@t3-oss/env-core'
+import { z } from 'zod'
+
+const server = {
+  NODE_ENV: z.enum(['development', 'test', 'production']).default('development'),
+  LOG_LEVEL: z.enum(['debug', 'info', 'warn', 'error']).default('info'),
+  APP_URL: z.string().url(),
+  DATABASE_URL: z.string().url(),
+  SUPABASE_URL: z.string().url(),
+  SUPABASE_PUBLISHABLE_KEY: z.string().min(1),
+  SUPABASE_SERVICE_ROLE_KEY: z.string().min(1),
+  TELEGRAM_BOT_TOKEN: z.string().min(1),
+  TELEGRAM_WEBHOOK_SECRET: z.string().min(1),
+  TELEGRAM_BOT_USERNAME: z.string().min(1),
+  OPENAI_API_KEY: z.string().min(1),
+  PARSER_MODEL: z.string().min(1).default('gpt-4.1-mini'),
+  SENTRY_DSN: z.string().url().optional(),
+  GCP_PROJECT_ID: z.string().min(1),
+  GCP_REGION: z.string().min(1).default('europe-west1'),
+  CLOUD_RUN_SERVICE_BOT: z.string().min(1).default('household-bot'),
+  SCHEDULER_SHARED_SECRET: z.string().min(1)
+}
+
+export const env = createEnv({
+  server,
+  runtimeEnv: process.env,
+  emptyStringAsUndefined: true,
+  onValidationError: (issues) => {
+    console.error('Invalid environment variables:')
+    console.error(JSON.stringify(issues, null, 2))
+    throw new Error('Environment validation failed')
+  }
+})

packages/config/src/index.ts

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+export { env } from './env'

packages/config/tsconfig.json

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+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "composite": true
+  },
+  "include": ["src/**/*.ts"]
+}