feat(db): add core Drizzle schema tables (hardware, games, gameVersions)

- Create lib/db/schema/ directory with barrel export index.ts
- Add hardware table with device_type enum (handled/console)
- Add games table with Steam metadata, sync fields, and JSON genres
- Add game_versions table with composite unique (gameId, buildId) and cascade delete

Refs: Chunk 2 of database schema implementation

lib/db/schema/gameVersions.ts

@@ -0,0 +1,25 @@
+import {
+  boolean,
+  pgTable,
+  text,
+  timestamp,
+  unique,
+} from "drizzle-orm/pg-core"
+import { games } from "./games"
+
+export const gameVersions = pgTable(
+  "game_versions",
+  {
+    id: text("id")
+      .primaryKey()
+      .$defaultFn(() => crypto.randomUUID()),
+    gameId: text("game_id")
+      .notNull()
+      .references(() => games.id, { onDelete: "cascade" }),
+    buildId: text("build_id"),
+    versionString: text("version_string"),
+    isLatest: boolean("is_latest").default(false).notNull(),
+    createdAt: timestamp("created_at").defaultNow().notNull(),
+  },
+  (table) => [unique("game_build_unique").on(table.gameId, table.buildId)]
+)

lib/db/schema/games.ts

@@ -0,0 +1,27 @@
+import {
+  boolean,
+  integer,
+  jsonb,
+  pgTable,
+  text,
+  timestamp,
+} from "drizzle-orm/pg-core"
+
+export const games = pgTable("games", {
+  id: text("id")
+    .primaryKey()
+    .$defaultFn(() => crypto.randomUUID()),
+  steamAppId: integer("steam_app_id").unique().notNull(),
+  title: text("title").notNull(),
+  description: text("description"),
+  publisher: text("publisher"),
+  developer: text("developer"),
+  genres: jsonb("genres").$type<string[]>(),
+  headerImage: text("header_image"),
+  capsuleImage: text("capsule_image"),
+  storeUrl: text("store_url"),
+  lastSync: timestamp("last_sync"),
+  syncStatus: text("sync_status").default("pending"),
+  createdAt: timestamp("created_at").defaultNow().notNull(),
+  updatedAt: timestamp("updated_at").defaultNow().notNull(),
+})

lib/db/schema/hardware.ts

@@ -0,0 +1,10 @@
+import { pgEnum, pgTable, text, timestamp } from "drizzle-orm/pg-core"
+
+export const deviceTypeEnum = pgEnum("device_type", ["handled", "console"])
+
+export const hardware = pgTable("hardware", {
+  slug: text("slug").primaryKey(),
+  name: text("name").notNull(),
+  deviceType: deviceTypeEnum("device_type").notNull(),
+  createdAt: timestamp("created_at").defaultNow().notNull(),
+})

lib/db/schema/index.ts

@@ -0,0 +1,6 @@
+// Barrel export — will be populated as schema files are created
+export * from "./games"
+export * from "./gameVersions"
+export * from "./hardware"
+export * from "./performanceEntries"
+export * from "./gamePlatformSupport"