feat: integrate Just Works app and native business setup

Preserve hosted website UX inside Archipelago, add isolated Business and owner-authorized native wallet setup, and include deployment handoff. Based on main with native signer import already accepted.

docker/justworks/boot.py

@@ -0,0 +1,17 @@
+"""Run the app adapter and isolated Business service with shared lifecycle."""
+import os
+import subprocess
+import time
+children = []
+try:
+    children.append(subprocess.Popen(['python3', 'business/server.py'], env={**os.environ,
+        'JWB_HOST':'127.0.0.1', 'JWB_PORT':'4310', 'JWB_BASE_PATH':'/business-demo',
+        'JWB_DATA_DIR':'/data/business', 'JWB_AUTH_MODE':'enforce',
+        'JWB_COOKIE_SECURE':'0', 'JWB_ARCHIPELAGO':'1'}))
+    children.append(subprocess.Popen(['python3', 'server.py']))
+    while all(child.poll() is None for child in children): time.sleep(0.5)
+finally:
+    for child in children:
+        if child.poll() is None: child.terminate()
+    for child in children: child.wait()
+raise SystemExit(1)