feat: complete Quantumancy web app — full frontend + docs

Frontend (React 18 + TS + Vite):
- Landing: glitching hero, live /api/stats veil ticker, mode cards, featured spirits
- Séance: three.js shader ghost (hue/form per entity, mood + audio-reactive),
  Ouija planchette board spelling utterances, transcript with TTS replay,
  entity dossier, direct contact streaming, passive/active listening
- Modes: Wire Ghost telemetry panel, EVP mic anomaly detection, WebUSB
  RTL-SDR sweep + waterfall (hardware pass pending), Ouija/Direct Contact
- Codex: public registry + entity dossiers, rarity tiers, i18n EN/ES complete
- State: VeilSocket (reconnect/backoff), seance reducer, auth context
- 72 vitest tests green; served by FastAPI at :7777

Docs: README + as-built plans 3-7

frontend/package.json

@@ -9,8 +9,15 @@
     "test": "vitest run"
   },
   "dependencies": {
+    "@fontsource/cinzel": "^5.3.0",
+    "@fontsource/ibm-plex-mono": "^5.3.0",
+    "@types/three": "^0.185.1",
+    "i18next": "^26.3.6",
     "react": "^18.3.1",
-    "react-dom": "^18.3.1"
+    "react-dom": "^18.3.1",
+    "react-i18next": "^17.0.10",
+    "react-router-dom": "^7.18.1",
+    "three": "^0.185.1"
   },
   "devDependencies": {
     "@testing-library/jest-dom": "^6.6.3",