Add Railway deployment config for 24/7 cloud paper trading

- Dockerfile: add templates copy, ENV PORT, update CMD to live engine
- Create src/live/health.py: threaded HTTP health server (/health, /state)
- Wire health server into src/live/run.py before engine loop
- Dashboard: add unauthenticated /health endpoint, use PORT env var
- Create railway.toml with Dockerfile builder and health check config
- docker-compose.yml: rename service to live-engine, add PORT env vars

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

src/dashboard.py

@@ -161,6 +161,11 @@ def validate_config(cfg):
 # ---------------------------------------------------------------------------
 # Routes
 # ---------------------------------------------------------------------------
+@app.route("/health")
+def health():
+    return jsonify({"status": "ok"})
+
+
 @app.route("/")
 @requires_auth
 def index():
@@ -589,4 +594,4 @@ def _parse_int_list(s):
 # Main
 # ---------------------------------------------------------------------------
 if __name__ == "__main__":
-    app.run(host="0.0.0.0", port=5000, debug=False)
+    app.run(host="0.0.0.0", port=int(os.environ.get("PORT", 5000)), debug=False)