feat(01-01): define DB schema, configure Drizzle Kit, write seed script

- Created src/lib/db/schema.ts with users table (id, email, password_hash, created_at)
- Created src/lib/db/index.ts exporting db singleton via Drizzle + Neon HTTP driver
- Created drizzle.config.ts pointing to schema.ts with postgresql dialect
- Created scripts/seed.ts reading AGENT_EMAIL/AGENT_PASSWORD to create hashed user row
- Generated drizzle/0000_milky_black_cat.sql migration (committed per user decision)
- db:migrate and db:seed pending user Neon database setup

teressa-copeland-homes/src/lib/db/schema.ts

@@ -0,0 +1,8 @@
+import { pgTable, text, timestamp } from "drizzle-orm/pg-core";
+
+export const users = pgTable("users", {
+  id: text("id").primaryKey().$defaultFn(() => crypto.randomUUID()),
+  email: text("email").notNull().unique(),
+  passwordHash: text("password_hash").notNull(),
+  createdAt: timestamp("created_at").defaultNow().notNull(),
+});