Phase 2: full compendium across all categories + PF2e data

- Scraped PF2e reference from Archives of Nethys ES into public/data/pf2e/
  (spells, creatures, feats, equipment, weapons, armor, ancestries, heritages,
  backgrounds, archetypes, actions, conditions, deities) via scripts/fetch_pf2e.ts
- Registry-driven compendium: system toggle + per-category nav + generic filters
- 5e expanded: weapons, armor, feats, conditions added alongside spells/monsters/items
- PF2e data served as static assets (fetched, not bundled) for fast native parse
- Cross-links: add spell->spellbook / item->inventory to a campaign character;
  add monster/creature -> open encounter
- Condition tooltips in combat sourced from the conditions glossary
- Tests: registry filter unit tests, compendium e2e (browse + cross-link)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

public/data/pf2e/index.json

@@ -0,0 +1,67 @@
+[
+  {
+    "category": "spell",
+    "file": "spells",
+    "count": 2455
+  },
+  {
+    "category": "creature",
+    "file": "creatures",
+    "count": 4702
+  },
+  {
+    "category": "condition",
+    "file": "conditions",
+    "count": 98
+  },
+  {
+    "category": "feat",
+    "file": "feats",
+    "count": 8402
+  },
+  {
+    "category": "ancestry",
+    "file": "ancestries",
+    "count": 94
+  },
+  {
+    "category": "heritage",
+    "file": "heritages",
+    "count": 432
+  },
+  {
+    "category": "background",
+    "file": "backgrounds",
+    "count": 612
+  },
+  {
+    "category": "archetype",
+    "file": "archetypes",
+    "count": 335
+  },
+  {
+    "category": "weapon",
+    "file": "weapons",
+    "count": 614
+  },
+  {
+    "category": "armor",
+    "file": "armor",
+    "count": 75
+  },
+  {
+    "category": "equipment",
+    "file": "equipment",
+    "count": 8605
+  },
+  {
+    "category": "action",
+    "file": "actions",
+    "count": 3950
+  },
+  {
+    "category": "deity",
+    "file": "deities",
+    "count": 716
+  }
+]