feat(android): Capacitor wrapper bundling the Fabric web frontend

Greenfield Android client built as a Capacitor shell (mirrors the
Desktop strategy — reuses the React SPA 100%):
- appId ai.hangman.fabric, appName Fabric, androidScheme http +
  usesCleartextTraffic (talks to the http Center/Guild backends; the
  login screen sets the Center base, so a phone points at a LAN/host
  URL instead of localhost).
- scripts/build-web.mjs builds Fabric.Frontend and copies dist -> www;
  npm run sync / apk:debug wire it to Gradle.
- Native android/ project (cap add android) committed; build outputs,
  www/, node_modules, local.properties gitignored.
- Launcher icons = the Fabric mark (adaptive: green mark on black,
  legacy + round) at all densities.

Verified: gradlew assembleDebug -> app-debug.apk (4.2MB) containing
assets/public/index.html + the SPA bundle + Fabric icons.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

package.json

@@ -0,0 +1,24 @@
+{
+  "name": "fabric-android",
+  "version": "0.1.0",
+  "private": true,
+  "description": "Capacitor Android shell that bundles the Fabric web frontend.",
+  "author": {
+    "name": "Hangman",
+    "email": "noreply@hangman-lab.top"
+  },
+  "scripts": {
+    "build:web": "node scripts/build-web.mjs",
+    "sync": "npm run build:web && cap sync android",
+    "open": "cap open android",
+    "apk:debug": "npm run build:web && cap sync android && cd android && ./gradlew assembleDebug",
+    "apk:release": "npm run build:web && cap sync android && cd android && ./gradlew assembleRelease"
+  },
+  "dependencies": {
+    "@capacitor/android": "^7.0.0",
+    "@capacitor/core": "^7.0.0"
+  },
+  "devDependencies": {
+    "@capacitor/cli": "^7.0.0"
+  }
+}