fix: Unicode syntax error в start_server.py

Проблема: bytes literal с Unicode символами (🔐, ╔, ║ и т.д.)

Решение:
- HTML response через .encode('utf-8') вместо bytes literal
- ASCII box drawing вместо Unicode символов
- Убраны emoji из print statements

Тест:
  python3 -m py_compile web-client/start_server.py

web-client/start_server.py

@@ -60,15 +60,16 @@ class AuthHandler(http.server.SimpleHTTPRequestHandler):
         self.send_header('Content-type', 'text/html; charset=utf-8')
         self.end_headers()
         
-        self.wfile.write(b'''
+        html = '''
             <html>
                 <head><title>401 Unauthorized</title></head>
                 <body>
-                    <h1>🔐 Wyoming Satellite — Authentication Required</h1>
+                    <h1>Wyoming Satellite - Authentication Required</h1>
                     <p>Please enter the password to access the Web UI.</p>
                 </body>
             </html>
-        ''')
+        '''
+        self.wfile.write(html.encode('utf-8'))
 
     def do_GET(self):
         """Handle GET requests with authentication."""
@@ -111,45 +112,50 @@ def main():
     # Create handler with password
     Handler = create_auth_handler(args.password)
 
-    print(f"""
-╔══════════════════════════════════════════════════════════╗
-║     🛰️  Wyoming Satellite WebSocket Client Server       ║
-╠══════════════════════════════════════════════════════════╣
-║  Serving: {str(SCRIPT_DIR):<45} ║
-║  URL:     http://localhost:{args.port:<36} ║
-║  Remote:  http://<your-ip>:{args.port:<32} ║
-║  Password: {'*' * len(args.password):<45} ║
-║                                                          ║
-║  Press Ctrl+C to stop                                    ║
-╚══════════════════════════════════════════════════════════╝
-    """)
+    print("""
++==========================================================+
+|     Wyoming Satellite WebSocket Client Server           |
++==========================================================+
+|  Serving: {:<53} |
+|  URL:     http://localhost:{:<29} |
+|  Remote:  http://<your-ip>:{:<25} |
+|  Password: {:<48} |
+|                                                          |
+|  Press Ctrl+C to stop                                    |
++==========================================================+
+    """.format(
+        str(SCRIPT_DIR),
+        args.port,
+        args.port,
+        '*' * len(args.password)
+    ))
 
     try:
         with ReusableTCPServer((args.host, args.port), Handler) as httpd:
-            print(f"🚀 Server started on http://{args.host}:{args.port}")
-            print("📖 Serving files from:", SCRIPT_DIR)
-            print(f"🔐 Password protected ({len(args.password)} characters)")
-            print("\n⌨️  Press Ctrl+C to stop\n")
+            print(f"Server started on http://{args.host}:{args.port}")
+            print("Serving files from:", SCRIPT_DIR)
+            print(f"Password protected ({len(args.password)} characters)")
+            print("\nPress Ctrl+C to stop\n")
             
             try:
                 httpd.serve_forever()
             except KeyboardInterrupt:
-                print("\n👋 Shutting down gracefully...")
+                print("\nShutting down gracefully...")
                 # Shutdown in a separate thread to avoid deadlock
                 shutdown_thread = threading.Thread(target=httpd.shutdown)
                 shutdown_thread.start()
                 shutdown_thread.join(timeout=2)
                 httpd.server_close()
-                print("✅ Server stopped successfully")
+                print("Server stopped successfully")
                 
     except OSError as e:
-        print(f"\n❌ Error: Could not bind to port {args.port}")
+        print(f"\nError: Could not bind to port {args.port}")
         print(f"   {e}")
-        print("\n💡 Try using a different port:")
+        print("\nTry using a different port:")
         print(f"   python3 {sys.argv[0]} --port 8081\n")
         sys.exit(1)
     except Exception as e:
-        print(f"\n❌ Unexpected error: {e}")
+        print(f"\nUnexpected error: {e}")
         sys.exit(1)