Add Pathfinder 2e game system mode

Implements PF2e as an alternative game system alongside D&D 5e/5.5e.
Settings modal "Game System" selector switches conditions, bestiary,
stat block layout, and initiative calculation between systems.

- Valued conditions with increment/decrement UX (Clumsy 2, Frightened 3)
- 2,502 PF2e creatures from bundled search index (77 sources)
- PF2e stat block: level, traits, Perception, Fort/Ref/Will, ability mods
- Perception-based initiative rolling
- System-scoped source cache (D&D and PF2e sources don't collide)
- Backwards-compatible condition rehydration (ConditionId[] → ConditionEntry[])
- Difficulty indicator hidden in PF2e mode (excluded from MVP)

Closes dostulata/initiative#19

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/web/src/adapters/production-adapters.ts

@@ -13,6 +13,7 @@ import {
 } from "../persistence/undo-redo-storage.js";
 import * as bestiaryCache from "./bestiary-cache.js";
 import * as bestiaryIndex from "./bestiary-index-adapter.js";
+import * as pf2eBestiaryIndex from "./pf2e-bestiary-index-adapter.js";
 
 export const productionAdapters: Adapters = {
 	encounterPersistence: {
@@ -41,4 +42,10 @@ export const productionAdapters: Adapters = {
 		getDefaultFetchUrl: bestiaryIndex.getDefaultFetchUrl,
 		getSourceDisplayName: bestiaryIndex.getSourceDisplayName,
 	},
+	pf2eBestiaryIndex: {
+		loadIndex: pf2eBestiaryIndex.loadPf2eBestiaryIndex,
+		getAllSourceCodes: pf2eBestiaryIndex.getAllPf2eSourceCodes,
+		getDefaultFetchUrl: pf2eBestiaryIndex.getDefaultPf2eFetchUrl,
+		getSourceDisplayName: pf2eBestiaryIndex.getPf2eSourceDisplayName,
+	},
 };