Add Lightning Terminal (litd) service for Loop Out support

Adds litd v0.16.0-alpha in remote mode connecting to lnd-1.
This enables Loop Out functionality for submarine swaps.

- Exposes ports 8443 (HTTPS) and 8080 (HTTP)
- UI password: testpassword123
- Configured for regtest network

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker-compose.yml

@@ -329,6 +329,37 @@ services:
       - ./data/lnd-4:/root/.lnd/
       - bitcoin-data:/root/.bitcoin
 
+  litd:
+    hostname: litd
+    depends_on:
+      - lnd-1
+    image: lightninglabs/lightning-terminal:v0.16.0-alpha
+    restart: on-failure
+    entrypoint: /bin/sh
+    command:
+      - -c
+      - |
+        echo "Waiting for LND to be ready..."
+        sleep 30
+        exec /usr/local/bin/litd \
+          --httpslisten=0.0.0.0:8443 \
+          --insecure-httplisten=0.0.0.0:8080 \
+          --uipassword=testpassword123 \
+          --network=regtest \
+          --lnd-mode=remote \
+          --remote.lnd.rpcserver=lnd-1:10009 \
+          --remote.lnd.macaroonpath=/root/.lnd/data/chain/bitcoin/regtest/admin.macaroon \
+          --remote.lnd.tlscertpath=/root/.lnd/tls.cert \
+          --autopilot.disable=true \
+          --loop.server.host=localhost:11009 \
+          --loop.server.notls=true
+    ports:
+      - 8443:8443
+      - 8080:8080
+    volumes:
+      - ./data/lnd-1:/root/.lnd:ro
+      - ./data/litd:/root/.lit
+
   eclair:
     hostname: eclair
     depends_on: