feat: game state, persistence, UI framework (Alpine+Tailwind), economy system (#10, #11, #12)

- Game state with localStorage save/load + reset (type DELETE to confirm)
- Alpine.js + Tailwind CSS + Lucide UI overlay (HUD bar, shop modal, settings, toasts)
- Economy: fish prices, tank tier costs/capacities, rarity multipliers, sell value formula
- Genetic system: hue/saturation/size/speed/pattern/rarity/gender + breeding inheritance
- Fish selection via raycaster (click fish = select, click empty = drop food)
- Buy/Sell/Breed/Upgrade actions wired to game state

vite.config.ts

@@ -1,6 +1,8 @@
 import { defineConfig } from "vite";
+import tailwindcss from "@tailwindcss/vite";
 
 export default defineConfig({
+  plugins: [tailwindcss()],
   build: {
     outDir: "dist"
   }