feat: initial elysium idle game prototype

Sets up the full monorepo with pnpm workspaces. Includes shared types
package, Hono API with Discord OAuth/JWT auth, Prisma v6 + MongoDB
Atlas, and React + Vite frontend with game loop, five tabs, and
Discord-linked save/load.

apps/api/src/data/upgrades.ts

@@ -0,0 +1,98 @@
+import type { Upgrade } from "@elysium/types";
+
+export const DEFAULT_UPGRADES: Upgrade[] = [
+  // Click upgrades
+  {
+    id: "click_1",
+    name: "Keen Eye",
+    description: "Your strikes find weak points. Doubles click power.",
+    target: "click",
+    multiplier: 2,
+    costGold: 100,
+    costEssence: 0,
+    purchased: false,
+    unlocked: true,
+  },
+  {
+    id: "click_2",
+    name: "Battle Hardened",
+    description: "Years of combat sharpen your instincts. Doubles click power again.",
+    target: "click",
+    multiplier: 2,
+    costGold: 1000,
+    costEssence: 0,
+    purchased: false,
+    unlocked: false,
+  },
+  {
+    id: "click_3",
+    name: "Legendary Weapon",
+    description: "A weapon of ancient power. Triples click power.",
+    target: "click",
+    multiplier: 3,
+    costGold: 50_000,
+    costEssence: 10,
+    purchased: false,
+    unlocked: false,
+  },
+  // Global upgrades
+  {
+    id: "global_1",
+    name: "Guild Charter",
+    description: "Formalising the guild structure increases all income by 25%.",
+    target: "global",
+    multiplier: 1.25,
+    costGold: 500,
+    costEssence: 0,
+    purchased: false,
+    unlocked: false,
+  },
+  {
+    id: "global_2",
+    name: "Merchant Alliance",
+    description: "Trade routes boost all income by 50%.",
+    target: "global",
+    multiplier: 1.5,
+    costGold: 10_000,
+    costEssence: 5,
+    purchased: false,
+    unlocked: false,
+  },
+  // Adventurer-specific upgrades
+  {
+    id: "peasant_1",
+    name: "Better Tools",
+    description: "Peasants work twice as hard with proper equipment.",
+    target: "adventurer",
+    adventurerId: "peasant",
+    multiplier: 2,
+    costGold: 200,
+    costEssence: 0,
+    purchased: false,
+    unlocked: false,
+  },
+  {
+    id: "militia_1",
+    name: "Militia Training",
+    description: "Formal training doubles militia effectiveness.",
+    target: "adventurer",
+    adventurerId: "militia",
+    multiplier: 2,
+    costGold: 1_000,
+    costEssence: 0,
+    purchased: false,
+    unlocked: false,
+  },
+  {
+    id: "mage_1",
+    name: "Arcane Tomes",
+    description: "Ancient books of magic double mage output.",
+    target: "adventurer",
+    adventurerId: "apprentice",
+    multiplier: 2,
+    costGold: 5_000,
+    costEssence: 2,
+    purchased: false,
+    unlocked: false,
+  },
+];