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/data/disciplines/invoker.ts

@@ -23,6 +23,7 @@ export const invokerDisciplines: DisciplineDefinition[] = [
         threshold: 200,
         value: 0,
         description: '+10 Base Damage',
+        bonus: { stat: 'baseDamageBonus', amount: 10 },
       },
       {
         id: 'spell-2',
@@ -30,6 +31,7 @@ export const invokerDisciplines: DisciplineDefinition[] = [
         threshold: 400,
         value: 30,
         description: 'Every 300 XP: +5 Base Damage',
+        bonus: { stat: 'baseDamageBonus', amount: 5 },
       },
     ],
   },