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>

convex/schema.ts

@@ -0,0 +1,93 @@
+import { defineSchema, defineTable } from "convex/server";
+import { v } from "convex/values";
+import { authTables } from "@convex-dev/auth/server";
+
+// Override the default users table to store NO personal data (GDPR compliance)
+// User profile info (name, email, etc.) must be fetched from Zitadel OIDC userinfo endpoint
+const minimalAuthTables = {
+  ...authTables,
+  // Override users table - only store what's required for auth to function
+  users: defineTable({
+    // No name, email, image, or any PII stored
+    // The auth system needs this table to exist but we strip all profile data
+  }),
+};
+
+export default defineSchema({
+  ...minimalAuthTables,
+
+  // Card printings with perceptual hashes
+  cards: defineTable({
+    scryfallId: v.string(),
+    oracleId: v.string(),
+    name: v.string(),
+    setCode: v.string(),
+    collectorNumber: v.string(),
+    rarity: v.string(),
+    artist: v.optional(v.string()),
+    imageUri: v.optional(v.string()),
+    hash: v.bytes(),              // 24-byte perceptual hash
+    hashVersion: v.number(),      // Algorithm version for migrations
+    updatedAt: v.number(),
+  })
+    .index("by_scryfall", ["scryfallId"])
+    .index("by_oracle", ["oracleId"])
+    .index("by_name", ["name"])
+    .index("by_updated", ["updatedAt"]),
+
+  // Oracle cards (abstract game cards)
+  oracles: defineTable({
+    oracleId: v.string(),
+    name: v.string(),
+    manaCost: v.optional(v.string()),
+    cmc: v.optional(v.number()),
+    typeLine: v.optional(v.string()),
+    oracleText: v.optional(v.string()),
+    colors: v.optional(v.array(v.string())),
+    colorIdentity: v.optional(v.array(v.string())),
+    keywords: v.optional(v.array(v.string())),
+    power: v.optional(v.string()),
+    toughness: v.optional(v.string()),
+  })
+    .index("by_oracle", ["oracleId"])
+    .index("by_name", ["name"]),
+
+  // MTG sets
+  sets: defineTable({
+    setId: v.string(),
+    code: v.string(),
+    name: v.string(),
+    setType: v.optional(v.string()),
+    releasedAt: v.optional(v.string()),
+    cardCount: v.optional(v.number()),
+    iconSvgUri: v.optional(v.string()),
+  })
+    .index("by_set", ["setId"])
+    .index("by_code", ["code"]),
+
+  // User collections
+  collections: defineTable({
+    userId: v.id("users"),
+    cardId: v.id("cards"),
+    quantity: v.number(),
+    isFoil: v.boolean(),
+    addedAt: v.number(),
+  })
+    .index("by_user", ["userId"])
+    .index("by_user_card", ["userId", "cardId", "isFoil"]),
+
+  // Scan history
+  scanHistory: defineTable({
+    userId: v.id("users"),
+    cardId: v.optional(v.id("cards")),
+    confidence: v.number(),
+    scannedAt: v.number(),
+    addedToCollection: v.boolean(),
+  }).index("by_user", ["userId"]),
+
+  // Sync metadata
+  metadata: defineTable({
+    key: v.string(),
+    value: v.string(),
+  }).index("by_key", ["key"]),
+});