refactor: convert to bun workspaces monorepo

- Move web app into apps/web/
- Create packages/shared/ with shared types
- Create plugins/decky-vault/ scaffold
- Root package.json manages workspaces only

apps/web/lib/db/schema/savedGames.ts

@@ -0,0 +1,27 @@
+import {
+  pgTable,
+  text,
+  timestamp,
+  unique,
+} from "drizzle-orm/pg-core"
+import { user } from "./auth"
+import { games } from "./games"
+
+export const savedGames = pgTable(
+  "saved_games",
+  {
+    id: text("id")
+      .primaryKey()
+      .$defaultFn(() => crypto.randomUUID()),
+    userId: text("user_id")
+      .notNull()
+      .references(() => user.id, { onDelete: "cascade" }),
+    gameId: text("game_id")
+      .notNull()
+      .references(() => games.id, { onDelete: "cascade" }),
+    createdAt: timestamp("created_at").defaultNow().notNull(),
+  },
+  (table) => [
+    unique("saved_games_user_game_unique").on(table.userId, table.gameId),
+  ],
+)