feat(db): @mosaic/db — Drizzle schema, PG connection, migrations (#67)

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

packages/db/package.json

@@ -1,6 +1,7 @@
 {
   "name": "@mosaic/db",
   "version": "0.0.0",
+  "type": "module",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
   "exports": {
@@ -13,10 +14,21 @@
     "build": "tsc",
     "lint": "eslint src",
     "typecheck": "tsc --noEmit",
-    "test": "vitest run"
+    "test": "vitest run",
+    "db:generate": "drizzle-kit generate",
+    "db:migrate": "drizzle-kit migrate",
+    "db:push": "drizzle-kit push",
+    "db:studio": "drizzle-kit studio"
   },
   "devDependencies": {
+    "@types/node": "^22.0.0",
+    "drizzle-kit": "^0.31.9",
+    "tsx": "^4.0.0",
     "typescript": "^5.8.0",
     "vitest": "^2.0.0"
+  },
+  "dependencies": {
+    "drizzle-orm": "^0.45.1",
+    "postgres": "^3.4.8"
   }
 }