feat: content expansion, prestige shop, and offline earnings improvements

- Expand content to 18 zones, 72 bosses, 95 quests, 32 adventurer tiers
- Add prestige shop with 24 runestone upgrades across 5 categories
- Add PrestigeUpgrade type, data files, API routes, and frontend panel
- Fix offline earnings to include equipment and runestone multipliers
- Add offline essence calculation alongside offline gold
- Update OfflineModal to display both gold and essence earned
- Add IDEAS.md for tracking planned features

apps/api/src/data/zones.ts

@@ -121,4 +121,64 @@ export const DEFAULT_ZONES: Zone[] = [
     unlockBossId: "void_emperor",
     unlockQuestId: "heart_of_void",
   },
+  {
+    id: "primordial_chaos",
+    name: "The Primordial Chaos",
+    description:
+      "Beyond the throne lies the raw stuff of creation itself — not a place but an ongoing argument between existence and non-existence that has never been resolved. Your guild enters the argument.",
+    emoji: "🌪️",
+    status: "locked",
+    unlockBossId: "the_apex",
+    unlockQuestId: "eternal_dominion",
+  },
+  {
+    id: "infinite_expanse",
+    name: "The Infinite Expanse",
+    description:
+      "A realm without edges, without centre, without reference — where distance is a concept that does not apply and your guild must define their own coordinates to navigate at all. Everything here is further than it looks.",
+    emoji: "♾️",
+    status: "locked",
+    unlockBossId: "primordial_titan",
+    unlockQuestId: "chaos_chronicle",
+  },
+  {
+    id: "reality_forge",
+    name: "The Reality Forge",
+    description:
+      "The workshop where the original universe was hammered into shape — still hot, still humming, still producing realities as a byproduct of its idle operation. The things that work here have never stopped.",
+    emoji: "⚒️",
+    status: "locked",
+    unlockBossId: "expanse_sovereign",
+    unlockQuestId: "expanse_codex",
+  },
+  {
+    id: "cosmic_maelstrom",
+    name: "The Cosmic Maelstrom",
+    description:
+      "A confluence of every force in existence, spinning in patterns that reduce galaxies to debris. Your guild navigates currents of energy that, on a good day, merely shatter planets.",
+    emoji: "🌀",
+    status: "locked",
+    unlockBossId: "reality_architect",
+    unlockQuestId: "forge_chronicle",
+  },
+  {
+    id: "primeval_sanctum",
+    name: "The Primeval Sanctum",
+    description:
+      "The oldest place that has ever existed — older than time, older than space, older than the concept of age itself. It holds something that remembers the moment before the first moment.",
+    emoji: "🗿",
+    status: "locked",
+    unlockBossId: "cosmic_annihilator",
+    unlockQuestId: "maelstrom_codex",
+  },
+  {
+    id: "the_absolute",
+    name: "The Absolute",
+    description:
+      "There is nothing beyond this. Not because nothing has been found — because nothing exists to find. The Absolute is the final truth: the end of all things that are and the beginning of all things that never were. Your guild stands at the edge of everything.",
+    emoji: "⚫",
+    status: "locked",
+    unlockBossId: "primeval_god",
+    unlockQuestId: "sanctum_chronicle",
+  },
 ];