balance: comprehensive game balance pass (#103-#123) (#124)

## Summary

Comprehensive balance pass addressing 20 tickets (#103–#122) plus one audit-discovered fix (#123), ensuring no player soft-locks and aligning all content counts with achievements and progression milestones.

### Changes

- **Equipment** (#103–#111): Differentiated all stat pairs so every piece has a unique bonus combination; added missing stats to `eternal_flame` and increased `eternal_prism` multiplier to justify cost tier
- **Recipes** (#112–#115): Added 4 cross-zone crafting recipes requiring materials from multiple zones to incentivise exploration breadth
- **Achievements** (#116–#118): Aligned `fully_equipped` (40→65), `quest_eternal` (72→95), and `boss_eternal` (60→72) thresholds with actual content counts; updated `devourer_slayer` description
- **Quest CP scaling** (#120–#122): Verified and corrected combat power requirements across all zones to follow consistent 4×/4× progression pattern
- **Zone file ordering** (#123): Swapped Frozen Peaks and Shadow Marshes quest sections so file order matches the actual unlock chain (no gameplay change)

### Tickets Closed

Closes #103
Closes #104
Closes #105
Closes #106
Closes #107
Closes #108
Closes #109
Closes #110
Closes #111
Closes #112
Closes #113
Closes #114
Closes #115
Closes #116
Closes #117
Closes #118
Closes #120
Closes #121
Closes #122
Closes #123

✨ This PR was created with help from Hikari~ 🌸

Reviewed-on: #124
Co-authored-by: Hikari <hikari@nhcarrigan.com>
Co-committed-by: Hikari <hikari@nhcarrigan.com>

apps/api/src/data/achievements.ts

@@ -149,7 +149,7 @@ export const defaultAchievements: Array<Achievement> = [
   },
   {
     condition:   { amount: 18, type: "bossesDefeated" },
-    description: "Defeat all 18 bosses, including the Devourer of Worlds.",
+    description: "Defeat all 18 bosses across the first six zones.",
     icon:        "🌟",
     id:          "devourer_slayer",
     name:        "World Saver",
@@ -223,8 +223,8 @@ export const defaultAchievements: Array<Achievement> = [
     unlockedAt:  null,
   },
   {
-    condition:   { amount: 40, type: "equipmentOwned" },
-    description: "Own 40 pieces of equipment.",
+    condition:   { amount: 65, type: "equipmentOwned" },
+    description: "Own all 65 pieces of equipment.",
     icon:        "🛡️",
     id:          "fully_equipped",
     name:        "Fully Equipped",
@@ -289,8 +289,8 @@ export const defaultAchievements: Array<Achievement> = [
     unlockedAt:  null,
   },
   {
-    condition:   { amount: 72, type: "questsCompleted" },
-    description: "Complete all 72 quests across the known multiverse.",
+    condition:   { amount: 95, type: "questsCompleted" },
+    description: "Complete all 95 quests across the known multiverse.",
     icon:        "🌌",
     id:          "quest_eternal",
     name:        "Quest Eternal",
@@ -317,8 +317,8 @@ export const defaultAchievements: Array<Achievement> = [
     unlockedAt:  null,
   },
   {
-    condition:   { amount: 60, type: "bossesDefeated" },
-    description: "Defeat all 60 bosses across every plane of existence.",
+    condition:   { amount: 72, type: "bossesDefeated" },
+    description: "Defeat all 72 bosses across every plane of existence.",
     icon:        "💀",
     id:          "boss_eternal",
     name:        "Eternal Vanquisher",