fix: reduce income_10 multiplier to avoid 5x jump from income_9 (#115)

apps/api/src/data/prestigeUpgrades.ts

@@ -92,18 +92,18 @@ export const defaultPrestigeUpgrades: Array<PrestigeUpgrade> = [
   {
     category: "income",
     description:
-      "The oldest runes, carved before memory began, yield their secrets at last. All production ×500.",
+      "The oldest runes, carved before memory began, yield their secrets at last. All production ×200.",
     id:             "income_10",
-    multiplier:     500,
+    multiplier:     200,
     name:           "Eternal Rune I",
     runestonesCost: 30_000,
   },
   {
     category: "income",
     description:
-      "Eternal runes resonate with the heartbeat of creation itself. All production ×1,000.",
+      "Eternal runes resonate with the heartbeat of creation itself. All production ×500.",
     id:             "income_11",
-    multiplier:     1000,
+    multiplier:     500,
     name:           "Eternal Rune II",
     runestonesCost: 80_000,
   },