```

chore: refactor logging module, update genesis timestamp, remove model relationships, and reorganize routers

- Rename logging.py to logger.py and update import paths in poa.py and main.py
- Update devnet genesis timestamp to 1766828620
- Remove SQLModel Relationship declarations from Block, Transaction, and Receipt models
- Add SessionDep type alias and get_session dependency in coordinator-api deps
- Reorganize coordinator-api routers: replace explorer/registry with exchange, users, marketplace

apps/trade-exchange/server.py

@@ -0,0 +1,54 @@
+#!/usr/bin/env python3
+"""
+Simple HTTP server for the AITBC Trade Exchange
+"""
+
+import os
+import sys
+from http.server import HTTPServer, SimpleHTTPRequestHandler
+import argparse
+
+class CORSHTTPRequestHandler(SimpleHTTPRequestHandler):
+    def end_headers(self):
+        self.send_header('Access-Control-Allow-Origin', '*')
+        self.send_header('Access-Control-Allow-Methods', 'GET, POST, OPTIONS')
+        self.send_header('Access-Control-Allow-Headers', 'Content-Type, X-Api-Key')
+        super().end_headers()
+
+    def do_OPTIONS(self):
+        self.send_response(200)
+        self.end_headers()
+
+def run_server(port=3002, directory=None):
+    """Run the HTTP server"""
+    if directory:
+        os.chdir(directory)
+    
+    server_address = ('', port)
+    httpd = HTTPServer(server_address, CORSHTTPRequestHandler)
+    
+    print(f"""
+╔═══════════════════════════════════════╗
+║     AITBC Trade Exchange Server       ║
+╠═══════════════════════════════════════╣
+║  Server running at:                   ║
+║  http://localhost:{port}               ║
+║                                       ║
+║  Buy AITBC with Bitcoin!              ║
+║  Press Ctrl+C to stop                  ║
+╚═══════════════════════════════════════╝
+    """)
+    
+    try:
+        httpd.serve_forever()
+    except KeyboardInterrupt:
+        print("\nShutting down server...")
+        httpd.server_close()
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(description='Run the AITBC Trade Exchange server')
+    parser.add_argument('--port', type=int, default=3002, help='Port to run the server on')
+    parser.add_argument('--dir', type=str, default='.', help='Directory to serve from')
+    
+    args = parser.parse_args()
+    run_server(port=args.port, directory=args.dir)