feat: pinia wallet, mints and activity stores with wallet boot

src/boot/wallet.ts

@@ -0,0 +1,11 @@
+import { defineBoot } from '#q-app';
+import { useWalletStore } from '@/stores/wallet';
+
+// Wallet lifecycle bootstrap: reflects whatever is on this device into the
+// wallet store at app start - a plaintext-stored key unlocks straight away,
+// a password-encrypted one lands on 'locked' for the unlock screen, and no
+// key at all lands on 'none' for onboarding.
+export default defineBoot(async () => {
+  const wallet = useWalletStore();
+  await wallet.init();
+});