feat: major endgame content expansion

- Add 6 new zones (Celestial Reaches through Eternal Throne) with sequential unlock chain
- Add 30 new bosses (5 per zone) scaling to 3e24 HP for true endgame challenge
- Add 36 new quests (6 per zone) with timers up to 96h for long-term progression
- Add 6 new adventurer tiers (seraph_knight through eternal_champion) requiring prestige 6-25
- Add ~36 new equipment pieces with boss drops and purchasable essence/crystal sinks
- Add new upgrades including endgame click/global multipliers and adventurer-specific unlocks
- Add 17 new achievements covering clicks (100K/1M), gold (quadrillion/quintillion), bosses (20/30/60), quests (30/50/72), adventurers (50K), prestige (5/10/25), and equipment (25/40)
- Extend formatNumber to support Q/Qt/S/Sp suffixes for numbers up to 1e24

apps/api/src/data/zones.ts

@@ -61,4 +61,64 @@ export const DEFAULT_ZONES: Zone[] = [
     unlockBossId: "phoenix_lord",
     unlockQuestId: "the_forge",
   },
+  {
+    id: "celestial_reaches",
+    name: "The Celestial Reaches",
+    description:
+      "Beyond the astral void, where reality gives way to pure divinity. The celestial host holds court here in towers of light older than stars, but their idea of order is as alien and terrifying as the chaos below.",
+    emoji: "✨",
+    status: "locked",
+    unlockBossId: "the_devourer",
+    unlockQuestId: "the_end",
+  },
+  {
+    id: "abyssal_trench",
+    name: "The Abyssal Trench",
+    description:
+      "At the bottom of all things, where no light reaches and pressure could crush continents, something old and patient waits. It has been waiting since before your world was made — and it has never been interrupted.",
+    emoji: "🌊",
+    status: "locked",
+    unlockBossId: "the_first_light",
+    unlockQuestId: "celestial_archive",
+  },
+  {
+    id: "infernal_court",
+    name: "The Infernal Court",
+    description:
+      "The courts of the underworld, where demon lords scheme across aeons. Power here is measured in souls and suffering — your guild deals in neither, but you will have to speak their language before this is over.",
+    emoji: "👿",
+    status: "locked",
+    unlockBossId: "elder_abomination",
+    unlockQuestId: "abyssal_chronicle",
+  },
+  {
+    id: "crystalline_spire",
+    name: "The Crystalline Spire",
+    description:
+      "A tower of living crystal that pierces every boundary between planes. Its facets reflect possibilities that have never existed and futures that cannot be. The intelligence at its core has been calculating since before this universe existed.",
+    emoji: "💎",
+    status: "locked",
+    unlockBossId: "the_fallen",
+    unlockQuestId: "infernal_codex",
+  },
+  {
+    id: "void_sanctum",
+    name: "The Void Sanctum",
+    description:
+      "Not a place but a state of being — the space between the spaces between things. Existence grows thin here. Your guild is the first to find it, drawn by a power that should not be able to call to anything that lives.",
+    emoji: "🌀",
+    status: "locked",
+    unlockBossId: "crystal_sovereign",
+    unlockQuestId: "the_prism_vault",
+  },
+  {
+    id: "eternal_throne",
+    name: "The Eternal Throne",
+    description:
+      "The seat of ultimate power at the centre of all creation. Whoever sits here has sat here since the beginning. They have watched countless guilds rise and fall across uncounted ages. Your guild has come to take the throne. It does not yield.",
+    emoji: "👑",
+    status: "locked",
+    unlockBossId: "void_emperor",
+    unlockQuestId: "heart_of_void",
+  },
 ];