chore: dev environment — signet testnet stack, mock LND RPCs, faucet button

Switch docker-compose from regtest to signet, add standalone testnet stack
(docker-compose.testnet.yml) with Bitcoin+LND+ThunderHub+Fedimint. Mock
backend now auto-detects Podman/Docker sockets and includes full LND/Lightning
RPC mocks. Dev scripts refactored with boot mode, testnet option, and macOS
EAGAIN fix for port cleanup. Added dev faucet button to Home.vue.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

neode-ui/src/views/Home.vue

@@ -345,13 +345,16 @@
                 <span class="text-purple-400 text-sm font-medium">{{ walletEcash.toLocaleString() }} sats</span>
               </div>
             </div>
-            <div class="home-card-buttons grid grid-cols-3 gap-2 mt-auto pt-4 shrink-0">
+            <div class="home-card-buttons grid grid-cols-4 gap-2 mt-auto pt-4 shrink-0">
               <button @click="showSendModal = true" class="home-card-btn px-3 py-2 glass-button rounded-lg text-sm font-medium text-center transition-colors">
                 {{ t('common.send') }}
               </button>
               <button @click="showReceiveModal = true" class="home-card-btn px-3 py-2 glass-button rounded-lg text-sm font-medium text-center transition-colors">
                 {{ t('web5.receiveBitcoin') }}
               </button>
+              <button @click="devFaucet" class="home-card-btn px-3 py-2 glass-button rounded-lg text-sm font-medium text-center transition-colors text-green-400">
+                Faucet
+              </button>
               <RouterLink to="/dashboard/web5" class="home-card-btn px-3 py-2 glass-button rounded-lg text-sm font-medium text-center transition-colors">
                 Web5
               </RouterLink>
@@ -719,6 +722,17 @@ onMounted(async () => {
 const showSendModal = ref(false)
 const showReceiveModal = ref(false)
 
+// Dev faucet — adds mock funds to all wallet types
+async function devFaucet() {
+  try {
+    const res = await rpcClient.call<{ message: string }>({ method: 'dev.faucet', params: { amount_sats: 1_000_000 } })
+    console.log('[Faucet]', res.message)
+    await loadWeb5Status()
+  } catch (err) {
+    console.error('[Faucet] Error:', err)
+  }
+}
+
 // Wallet balances and transactions (fetched from RPC)
 const walletConnected = ref(false)
 const walletOnchain = ref(0)