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>

lib/recognition/index.ts

@@ -0,0 +1,67 @@
+/**
+ * Card recognition module exports.
+ */
+
+// Recognition service
+export {
+  recognizeCard,
+  computeImageHash,
+  calculateConfidence,
+  createRecognitionService,
+  type RecognitionOptions,
+  type RecognitionResult,
+  type CardMatch,
+  type CardHashEntry,
+} from "./recognitionService";
+
+// Card detection
+export {
+  detectCard,
+  type CardDetectionResult,
+} from "./cardDetector";
+
+// Perspective correction
+export {
+  warpPerspective,
+  OUTPUT_WIDTH,
+  OUTPUT_HEIGHT,
+} from "./perspectiveCorrection";
+
+// CLAHE preprocessing
+export { applyCLAHE } from "./clahe";
+
+// Perceptual hashing
+export {
+  computeColorHash,
+  hammingDistance,
+  hashToHex,
+  hexToHash,
+  HASH_VERSION,
+  MATCH_THRESHOLD,
+  HASH_BITS,
+} from "./perceptualHash";
+
+// Image utilities
+export {
+  resizeImage,
+  rotateImage,
+  toGrayscale,
+  grayscaleToRgba,
+  gaussianBlur,
+  distance,
+  type Point,
+  type Size,
+} from "./imageUtils";
+
+// Image loading
+export {
+  loadImageForRecognition,
+  loadImageAsBase64,
+} from "./imageLoader";
+
+// Skia image decoding
+export {
+  decodeImageBase64,
+  decodeImageFromUri,
+  useDecodedImage,
+} from "./skiaDecoder";