added default transport node

New TinyWeb instances now auto-connect to reticulum.derickphan.com:4242
so users get internet mesh connectivity out of the box without any
manual Reticulum configuration. Env var overrides still supported.

app.py

@@ -11,6 +11,8 @@ from gateway import GatewayState, GatewayHandler, GATEWAY_PORT
 APP_NAME = "tinyweb"
 ASPECTS = ["server"]
 IDENTITY_FILE = "tinyweb_identity"
+DEFAULT_TRANSPORT_HOST = "reticulum.derickphan.com"
+DEFAULT_TRANSPORT_PORT = 4242
 
 
 def load_or_create_identity():
@@ -40,9 +42,41 @@ def start_gateway(reticulum):
     thread.start()
 
 
+def ensure_rns_config(config_dir):
+    """Generate a default Reticulum config with internet transport if none exists."""
+    if config_dir is None:
+        config_dir = os.path.expanduser("~/.reticulum")
+    config_file = os.path.join(config_dir, "config")
+    if os.path.exists(config_file):
+        return
+    os.makedirs(config_dir, exist_ok=True)
+    with open(config_file, "w") as f:
+        f.write(f"""[reticulum]
+  enable_transport = False
+  share_instance = Yes
+
+[logging]
+  loglevel = 4
+
+[interfaces]
+  [[Default Interface]]
+    type = AutoInterface
+    enabled = Yes
+
+  [[TCP Transport]]
+    type = TCPClientInterface
+    enabled = yes
+    target_host = {DEFAULT_TRANSPORT_HOST}
+    target_port = {DEFAULT_TRANSPORT_PORT}
+""")
+    print(f"Created Reticulum config at {config_file}")
+
+
 def main():
     init_db()
-    reticulum = RNS.Reticulum(configdir=os.environ.get("RNS_CONFIG_DIR"))
+    config_dir = os.environ.get("RNS_CONFIG_DIR")
+    ensure_rns_config(config_dir)
+    reticulum = RNS.Reticulum(configdir=config_dir)
     identity = load_or_create_identity()
 
     destination = RNS.Destination(