refactor: migrate P2P network from Redis gossip to direct TCP mesh architecture

- Replaced Redis-based P2P with direct TCP connections for decentralized mesh networking
- Added handshake protocol with node_id exchange for peer authentication
- Implemented bidirectional connection management (inbound/outbound streams)
- Added peer dialing loop to continuously reconnect to initial peers
- Added ping/pong keepalive mechanism to maintain active connections
- Prevented duplicate connections through endpoint

systemd/aitbc-ai.service

@@ -1,38 +0,0 @@
-[Unit]
-Description=AITBC Advanced AI Service - Enhanced AI Capabilities
-After=network.target
-Wants=network.target
-
-[Service]
-Type=simple
-User=root
-Group=root
-WorkingDirectory=/opt/aitbc/apps/coordinator-api
-Environment=PATH=/usr/bin
-Environment=PYTHONPATH=/opt/aitbc/apps/coordinator-api/src
-ExecStart=/opt/aitbc/venv/bin/python -m app.services.advanced_ai_service
-ExecReload=/bin/kill -HUP $MAINPID
-Restart=always
-RestartSec=10
-StandardOutput=journal
-StandardError=journal
-SyslogIdentifier=aitbc-advanced-ai
-
-# Security settings (relaxed for development)
-# NoNewPrivileges=true
-# PrivateTmp=true
-# ProtectSystem=strict
-# ProtectHome=true
-ReadWritePaths=/var/log/aitbc /var/lib/aitbc/data /opt/aitbc/apps/coordinator-api
-
-# Resource limits
-LimitNOFILE=65536
-LimitNPROC=4096
-
-# GPU access (if available)
-DeviceAllow=/dev/nvidia0 rw
-DeviceAllow=/dev/nvidiactl rw
-DeviceAllow=/dev/nvidia-uvm rw
-
-[Install]
-WantedBy=multi-user.target