feat: add missing quests to Frozen Peaks zone

- Added glacier_tomb (200K combat, 2.5hr) between frozen_wastes and ice_caves
- Added frozen_throne (3M combat, 7hr) after storm_citadel
- Updated ice_caves prerequisite to chain from glacier_tomb
- Frozen Peaks now has 5 quests, in line with other zones

Closes #139

apps/api/src/data/quests.ts

@@ -157,6 +157,21 @@ export const defaultQuests: Array<Quest> = [
     status: "locked",
     zoneId: "frozen_peaks",
   },
+  {
+    combatPowerRequired: 200_000,
+    description:
+      "A tomb sealed within a glacier for millennia. The soldiers interred here died guarding something that no longer exists — but their treasures remain.",
+    durationSeconds: 150 * 60,
+    id:              "glacier_tomb",
+    name:            "The Glacier Tomb",
+    prerequisiteIds: [ "frozen_wastes" ],
+    rewards:         [
+      { amount: 10_000_000, type: "gold" },
+      { amount: 3000, type: "essence" },
+    ],
+    status: "locked",
+    zoneId: "frozen_peaks",
+  },
   {
     combatPowerRequired: 400_000,
     description:
@@ -164,7 +179,7 @@ export const defaultQuests: Array<Quest> = [
     durationSeconds: 3 * 60 * 60,
     id:              "ice_caves",
     name:            "The Ice Caves",
-    prerequisiteIds: [ "frozen_wastes" ],
+    prerequisiteIds: [ "glacier_tomb" ],
     rewards:         [
       { amount: 5000, type: "essence" },
       { amount: 200, type: "crystals" },
@@ -188,6 +203,22 @@ export const defaultQuests: Array<Quest> = [
     status: "locked",
     zoneId: "frozen_peaks",
   },
+  {
+    combatPowerRequired: 3_000_000,
+    description:
+      "Deep in the peaks lies the throne room of an ancient frost king, long dead, whose dominion over cold and storm was absolute. His crown still waits.",
+    durationSeconds: 7 * 60 * 60,
+    id:              "frozen_throne",
+    name:            "The Frozen Throne",
+    prerequisiteIds: [ "storm_citadel" ],
+    rewards:         [
+      { amount: 60_000_000, type: "gold" },
+      { amount: 25_000, type: "essence" },
+      { amount: 400, type: "crystals" },
+    ],
+    status: "locked",
+    zoneId: "frozen_peaks",
+  },
   // ── Shadow Marshes ────────────────────────────────────────────────────────
   {
     combatPowerRequired: 5_000_000,