single-command startup

app.py now auto-starts the gateway HTTP server in a daemon thread,
so users only need `python app.py` to get everything running. The
gateway calls dispatch_request directly when co-located (local mode)
instead of trying to establish an RNS link to itself. Bookmarklet
hardcoded to localhost:8080. gateway.py still works standalone for
connecting to remote instances.

app.py

@@ -1,9 +1,12 @@
 import os
 import time
+import threading
 import RNS
+from http.server import HTTPServer
 
 from db import init_db
 from handlers import dispatch_request
+from gateway import GatewayState, GatewayHandler, GATEWAY_PORT
 
 APP_NAME = "tinyweb"
 ASPECTS = ["server"]
@@ -24,6 +27,14 @@ def rns_request_handler(path, data, request_id, link_id, remote_identity, reques
     return dispatch_request(data)
 
 
+def start_gateway(reticulum):
+    GatewayState.reticulum = reticulum
+    GatewayState.local_dispatch = dispatch_request
+    server = HTTPServer(("127.0.0.1", GATEWAY_PORT), GatewayHandler)
+    thread = threading.Thread(target=server.serve_forever, daemon=True)
+    thread.start()
+
+
 def main():
     init_db()
     reticulum = RNS.Reticulum()
@@ -44,10 +55,11 @@ def main():
     )
 
     destination.announce()
+    start_gateway(reticulum)
 
-    print(f"TinyWeb Reticulum server running")
-    print(f"Destination hash: {RNS.prettyhexrep(destination.hash)}")
-    print(f"Share this hash with clients to connect via gateway.py")
+    print(f"TinyWeb running!")
+    print(f"Open http://localhost:{GATEWAY_PORT} in your browser")
+    print(f"Destination hash: {RNS.prettyhexrep(destination.hash)} (share this so friends can subscribe)")
 
     while True:
         time.sleep(1)