balance: reduce echo meta upgrade costs for a more reasonable transcendence loop (#179)

apps/api/src/data/transcendenceUpgrades.ts

@@ -127,7 +127,7 @@ export const defaultTranscendenceUpgrades: Array<TranscendenceUpgrade> = [
   // ── Echo meta multipliers ───────────────────────────────────────────────────
   {
     category: "echo_meta",
-    cost:     25,
+    cost:     15,
     description:
       "Your transcendence resonates deeper, amplifying future echo yields by 25%.",
     id:         "echo_meta_1",
@@ -136,7 +136,7 @@ export const defaultTranscendenceUpgrades: Array<TranscendenceUpgrade> = [
   },
   {
     category: "echo_meta",
-    cost:     75,
+    cost:     45,
     description:
       "Each loop of existence makes the next more powerful — future echo yields +50%.",
     id:         "echo_meta_2",
@@ -145,7 +145,7 @@ export const defaultTranscendenceUpgrades: Array<TranscendenceUpgrade> = [
   },
   {
     category: "echo_meta",
-    cost:     200,
+    cost:     100,
     description:
       "You have mastered the infinite spiral of transcendence, doubling all future echo yields.",
     id:         "echo_meta_3",