Migrate from .NET MAUI to Expo + Convex

Complete rewrite of Scry using TypeScript stack:

- Expo/React Native with Expo Router (file-based routing)
- Convex backend (serverless functions + real-time database)
- Adaptive camera system (expo-camera in Expo Go, Vision Camera in production)
- React Native Skia + fast-opencv for image processing
- GDPR-compliant auth setup with Zitadel OIDC (pending configuration)

Key features:
- Card recognition pipeline ported to TypeScript
- Perceptual hashing (192-bit color pHash)
- CLAHE preprocessing for lighting normalization
- Local SQLite cache with Convex sync
- Collection management with offline support

Removes all .NET/MAUI code (src/, test/, tools/).

💘 Generated with Crush

Assisted-by: Claude Opus 4.5 via Crush <crush@charm.land>

package.json

@@ -0,0 +1,61 @@
+{
+  "name": "app",
+  "main": "expo-router/entry",
+  "version": "1.0.0",
+  "scripts": {
+    "start": "expo start",
+    "dev": "concurrently \"bunx convex dev\" \"expo start --android\"",
+    "dev:convex": "bunx convex dev",
+    "dev:expo": "expo start",
+    "android": "expo start --android",
+    "ios": "expo start --ios",
+    "web": "expo start --web",
+    "migrate": "tsx scripts/migrate-hashes.ts",
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {
+    "@auth/core": "^0.37.4",
+    "@convex-dev/auth": "^0.0.90",
+    "@expo/vector-icons": "^15.0.3",
+    "@react-navigation/native": "^7.1.8",
+    "@shopify/react-native-skia": "^2.4.18",
+    "convex": "^1.31.7",
+    "expo": "~54.0.33",
+    "expo-auth-session": "^7.0.10",
+    "expo-camera": "^17.0.10",
+    "expo-constants": "~18.0.13",
+    "expo-crypto": "^15.0.8",
+    "expo-font": "~14.0.11",
+    "expo-image-manipulator": "^14.0.8",
+    "expo-linking": "~8.0.11",
+    "expo-router": "~6.0.23",
+    "expo-secure-store": "^15.0.8",
+    "expo-splash-screen": "~31.0.13",
+    "expo-sqlite": "^16.0.10",
+    "expo-status-bar": "~3.0.9",
+    "expo-web-browser": "~15.0.10",
+    "react": "19.1.0",
+    "react-dom": "19.1.0",
+    "react-native": "0.81.5",
+    "react-native-fast-opencv": "^0.4.7",
+    "react-native-reanimated": "~4.1.1",
+    "react-native-safe-area-context": "~5.6.0",
+    "react-native-screens": "~4.16.0",
+    "react-native-vision-camera": "^4.7.3",
+    "react-native-web": "~0.21.0",
+    "react-native-worklets": "0.5.1",
+    "react-native-worklets-core": "^1.6.2"
+  },
+  "devDependencies": {
+    "@types/better-sqlite3": "^7.6.12",
+    "@types/node": "^22.10.0",
+    "@types/react": "~19.1.0",
+    "better-sqlite3": "^11.6.0",
+    "concurrently": "^9.1.0",
+    "dotenv": "^16.4.7",
+    "react-test-renderer": "19.1.0",
+    "tsx": "^4.19.2",
+    "typescript": "~5.9.2"
+  },
+  "private": true
+}