feat: add equipment, achievements, and visual polish

- Equipment system: 12 items across weapon/armour/trinket slots with
  common/rare/epic/legendary rarities; starter commons auto-equipped,
  higher tiers drop from boss victories
- Achievement system: 15 milestones with typed conditions; checked
  each tick and crystal rewards applied automatically
- Achievement toast: slide-in notification, auto-dismisses after 4s
- Floating click text: +X gold floats on each manual click
- Expanded quests (9 total) and upgrades (12 total)
- Upgrade panel now shows locked upgrades so players can see their
  progression path
- formatNumber utility (K/M/B/T) used consistently across all panels
- Backfill logic for existing saves to add new content gracefully
- types package now emits .d.ts declarations

apps/api/src/data/upgrades.ts

@@ -58,6 +58,17 @@ export const DEFAULT_UPGRADES: Upgrade[] = [
     purchased: false,
     unlocked: false,
   },
+  {
+    id: "global_3",
+    name: "Royal Patronage",
+    description: "The king himself backs your guild. All income doubled.",
+    target: "global",
+    multiplier: 2,
+    costGold: 1_000_000,
+    costEssence: 100,
+    purchased: false,
+    unlocked: false,
+  },
   // Adventurer-specific upgrades
   {
     id: "peasant_1",
@@ -95,4 +106,40 @@ export const DEFAULT_UPGRADES: Upgrade[] = [
     purchased: false,
     unlocked: false,
   },
+  {
+    id: "cleric_1",
+    name: "Holy Rites",
+    description: "Sacred ceremonies double the output of your clerics.",
+    target: "adventurer",
+    adventurerId: "acolyte",
+    multiplier: 2,
+    costGold: 8_000,
+    costEssence: 3,
+    purchased: false,
+    unlocked: false,
+  },
+  {
+    id: "scout_1",
+    name: "Stealth Training",
+    description: "Advanced scouting techniques double ranger effectiveness.",
+    target: "adventurer",
+    adventurerId: "ranger",
+    multiplier: 2,
+    costGold: 15_000,
+    costEssence: 5,
+    purchased: false,
+    unlocked: false,
+  },
+  {
+    id: "knight_1",
+    name: "Tempered Steel",
+    description: "Superior forging techniques double the output of your knights.",
+    target: "adventurer",
+    adventurerId: "knight",
+    multiplier: 2,
+    costGold: 50_000,
+    costEssence: 10,
+    purchased: false,
+    unlocked: false,
+  },
 ];