feat: add AFC Store with MercadoPago purchases and prize redemption

Players can now buy AfterCoin with real money (MercadoPago Checkout Pro,
$15 MXN/AFC) and redeem AFC for gift cards or cash withdrawals. Admin
fulfills redemptions manually.

- Bridge: payments + redemptions tables, CRUD routes, PATCH auth
- Next.js API: verify-disk, balance, create-preference, webhook (idempotent
  minting with HMAC signature verification), redeem, payment/redemption history
- Frontend: hub, buy flow (4 packages + custom), redeem flow (gift cards +
  cash out), success/failure/pending pages, history with tabs, 8 components
- i18n: full English + Spanish translations
- Infra: nginx /api/afc/ → Next.js, docker-compose env vars, .env.example

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package-lock.json

@@ -37,6 +37,40 @@
         "npm": ">=6.0.0"
       }
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+    "apps/cms/node_modules/react-dom": {
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+      "license": "MIT",
+      "dependencies": {
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+        "scheduler": "^0.23.2"
+      },
+      "peerDependencies": {
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+    "apps/cms/node_modules/scheduler": {
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+      "resolved": "https://registry.npmjs.org/scheduler/-/scheduler-0.23.2.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "loose-envify": "^1.1.0"
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+    },
     "apps/web": {
       "name": "@afterlife/web",
       "version": "0.1.0",
@@ -44,10 +78,12 @@
         "@afterlife/shared": "*",
         "framer-motion": "^12.34.3",
         "howler": "^2.2.4",
+        "mercadopago": "^2.12.0",
         "next": "^15",
         "next-intl": "^4.8.3",
         "react": "^19",
-        "react-dom": "^19"
+        "react-dom": "^19",
+        "uuid": "^13.0.0"
       },
       "devDependencies": {
         "@tailwindcss/postcss": "^4",
@@ -61,6 +97,19 @@
         "typescript": "^5"
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+      "funding": [
+        "https://github.com/sponsors/broofa",
+        "https://github.com/sponsors/ctavan"
+      ],
+      "license": "MIT",
+      "bin": {
+        "uuid": "dist-node/bin/uuid"
+      }
+    },
     "node_modules/@afterlife/cms": {
       "resolved": "apps/cms",
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+      "funding": [
+        "https://github.com/sponsors/broofa",
+        "https://github.com/sponsors/ctavan"
+      ],
+      "license": "MIT",
+      "bin": {
+        "uuid": "dist/bin/uuid"
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@@ -19095,6 +19166,26 @@
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@@ -24152,6 +24243,12 @@
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@@ -25546,6 +25643,12 @@
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+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
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@@ -25739,6 +25842,16 @@
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+    "node_modules/whatwg-url": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",
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+      "license": "MIT",
+      "dependencies": {
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