refactor: Redesign Invoker disciplines for pact bonuses and guardian boons

- Replace generic spell-casting/void-manipulation with pact-focused disciplines
- Add Pact Attunement (light): reduces pact signing time, boosts pact affinity
- Add Guardian's Boon (dark): amplifies all guardian unique perks
- Add pactAffinityBonus and guardianBoonMultiplier stat keys to effect system
- Apply pactAffinityBonus in pact signing time calculation (gameStore)
- Scale guardian boon values by guardianBoonMultiplier (combat-utils)
- Guard Invoker discipline activation behind signedPacts.length > 0
- Add 'Signed guardian pact' prerequisite display in discipline-math

src/lib/game/effects/discipline-effects.ts

@@ -23,6 +23,8 @@ const KNOWN_BONUS_STATS = new Set([
   'baseDamageBonus',
   'elementCapBonus',
   'meditationCapBonus',
+  'pactAffinityBonus',
+  'guardianBoonMultiplier',
 ]);
 
 export interface DisciplineEffectsResult {