fix: make discipline perk numerical bonuses functional via structured BonusSpec

- Add PerkBonus type and optional bonus field to DisciplinePerk
- Populate bonus data on 39 perks across base, elemental, elemental-regen,
  elemental-regen-advanced, and invoker discipline files
- Rewrite computeDisciplineEffects() to apply once/infinite/capped perk bonuses
  through known stat keys (maxManaBonus, baseDamageBonus, regen_*, elementCap_*)
- Add per-element cap bonus routing in effects.ts computeAllEffects()
- Remove dead enchantPower bonus (no consumer in effects pipeline)

src/lib/game/effects.ts

@@ -102,6 +102,14 @@ export function computeAllEffects(
     }
   }
 
+  // Merge per-element cap bonuses from discipline effects (elementCap_{element})
+  for (const [key, value] of Object.entries(disciplineEffects.bonuses)) {
+    if (key.startsWith('elementCap_')) {
+      const element = key.replace('elementCap_', '');
+      perElementCapBonus[element] = (perElementCapBonus[element] || 0) + value;
+    }
+  }
+
   const merged: UnifiedEffects = {
     ...upgradeEffects,
     maxManaBonus: upgradeEffects.maxManaBonus + (equipmentEffects.bonuses.maxMana || 0) + (disciplineEffects.bonuses.maxManaBonus || 0),