feat(docker): streamline regtest dev environment

- Fix EXTENSION_SERVICE_URL default to localhost (was hardcoded LAN IP)
- Fix strfry healthcheck (BusyBox nc lacks -z, use /proc/net/tcp)
- Add LP healthcheck + depends_on strfry
- Add regtest-bootstrap.sh: funds LND, opens channels, creates LP app
- Add regtest.sh: single management script (up/down/reset/status/logs/lncli/bitcoin)
- Minimal start uses only 3 containers (bitcoind, lnd-1, lnd-4) instead of 17

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

docker/docker-compose.regtest.yml

@@ -4,16 +4,22 @@
 # environment at ~/dev/local/docker/regtest
 #
 # Usage:
-#   1. Start the regtest environment:
-#      cd ~/dev/local/docker/regtest && ./start-regtest
+#   1. Start regtest (minimal — only what LP needs):
+#      cd ~/dev/local/docker/regtest && docker compose up -d bitcoind lnd-1 lnd-4
 #
 #   2. Start lamassu services:
-#      cd lamassu-next/docker && docker compose -f docker-compose.regtest.yml up -d
+#      cd docker && docker compose -f docker-compose.regtest.yml up -d
 #
-#   3. Configure apps/machine/.env:
+#   3. Bootstrap (funds LND, opens channels, creates LP app):
+#      cd docker && ./regtest-bootstrap.sh
+#
+#   4. Configure apps/machine/.env:
 #      VITE_RELAY_URL=ws://localhost:7777
 #      VITE_EXTENSION_API_URL=http://localhost:1777
 #
+# Phone wallet testing (LNURL callbacks need LAN IP):
+#   HOST_IP=192.168.1.100 docker compose -f docker-compose.regtest.yml up -d
+#
 # Services:
 #   - strfry: Private Nostr relay (port 7777)
 #   - lightning-pub: Nostr-native Lightning account system (port 1776)
@@ -37,10 +43,11 @@ services:
         soft: 524288
         hard: 524288
     healthcheck:
-      test: ['CMD', 'nc', '-z', 'localhost', '7777']
-      interval: 10s
-      timeout: 5s
-      retries: 5
+      # Check port 7777 (0x1E61) is listening via procfs — BusyBox nc lacks -z flag
+      test: ['CMD-SHELL', 'grep -q ":1E61 " /proc/net/tcp']
+      interval: 5s
+      timeout: 3s
+      retries: 10
     restart: unless-stopped
     networks:
       - regtest
@@ -76,7 +83,16 @@ services:
       - ADMIN_TOKEN=lamassu-dev-admin-token
       # Extension HTTP API URL (for LNURL callbacks from external wallets)
       # Use HOST_IP env var for your machine's LAN IP (required for phone wallets)
-      - EXTENSION_SERVICE_URL=http://${HOST_IP:-192.168.1.190}:1777
+      - EXTENSION_SERVICE_URL=http://${HOST_IP:-localhost}:1777
+    depends_on:
+      strfry:
+        condition: service_healthy
+    healthcheck:
+      test: ['CMD-SHELL', 'curl -so /dev/null -w "%{http_code}" http://localhost:1776 | grep -q .']
+      interval: 10s
+      timeout: 5s
+      retries: 30
+      start_period: 30s
     restart: unless-stopped
     networks:
       - regtest