refactor: remove legacy GPU services, keep latest aitbc-multimodal-gpu.service

GPU Services Cleanup - Complete:
✅ LEGACY GPU SERVICES REMOVED: Cleaned up old GPU services, kept latest implementation
- systemd/aitbc-gpu-miner.service: Removed (legacy simple mining client)
- systemd/aitbc-gpu-multimodal.service: Removed (intermediate version)
- systemd/aitbc-gpu-registry.service: Removed (demo service)
- systemd/aitbc-multimodal-gpu.service: Kept (latest advanced implementation)

✅ SERVICE DIRECTORIES CLEANED:
🗑️ aitbc-gpu-miner.service.d: Removed configuration directory
🗑️ aitbc-gpu-multimodal.service.d: Removed configuration directory
🗑️ aitbc-gpu-registry.service.d: Removed configuration directory
📁 aitbc-multimodal-gpu.service: Preserved with all configuration

✅ LATEST SERVICE ADVANTAGES:
🔧 aitbc-multimodal-gpu.service: Most advanced GPU service
👤 Standard User: Uses 'aitbc' user instead of 'debian'
📁 Standard Paths: Uses /opt/aitbc/ instead of /home/debian/
🎯 Module Structure: Proper Python module organization
🔒 Security: Comprehensive security settings and resource limits
📊 Integration: Proper coordinator API integration
📚 Documentation: Has proper documentation reference

✅ REMOVED SERVICES ANALYSIS:
❌ aitbc-gpu-miner.service: Basic mining client, non-standard paths
❌ aitbc-gpu-multimodal.service: Intermediate version, mixed paths
❌ aitbc-gpu-registry.service: Demo service, limited functionality
✅ aitbc-multimodal-gpu.service: Production-ready, standard configuration

✅ DOCUMENTATION UPDATED:
📚 Enhanced Services Guide: Updated references to use aitbc-multimodal-gpu
📝 Service Names: Changed aitbc-gpu-multimodal to aitbc-multimodal-gpu
🔧 Systemctl Commands: Updated service references
📋 Management Scripts: Updated log commands

✅ CLEANUP BENEFITS:
✅ Single GPU Service: One clear GPU service to manage
✅ No Confusion: No multiple similar GPU services
✅ Standard Configuration: Uses AITBC standards
✅ Better Maintenance: Only one GPU service to maintain
✅ Clear Documentation: References updated to latest service

✅ REMAINING GPU INFRASTRUCTURE:
🔧 aitbc-multimodal-gpu.service: Main GPU service (port 8011)
📁 apps/coordinator-api/src/app/services/gpu_multimodal_app.py: Service implementation
🎯 CUDA Integration: Proper GPU access controls
📊 Resource Management: Memory and CPU limits configured

RESULT: Successfully removed legacy GPU services and kept the latest aitbc-multimodal-gpu.service, providing a clean, single GPU service with proper configuration and updated documentation references.

systemd/aitbc-gpu-miner.service

@@ -1,28 +0,0 @@
-[Unit]
-Description=AITBC GPU Miner Client
-After=network.target
-Wants=network.target
-
-[Service]
-Type=simple
-User=debian
-Group=debian
-WorkingDirectory=/home/debian/aitbc
-Environment=PYTHONPATH=/home/debian/aitbc
-ExecStart=/usr/bin/python3 /home/debian/aitbc/gpu_miner_simple.py
-Restart=on-failure
-RestartSec=30
-StartLimitInterval=300
-StartLimitBurst=5
-StandardOutput=journal
-StandardError=journal
-SyslogIdentifier=aitbc-gpu-miner
-
-# Security settings
-NoNewPrivileges=true
-PrivateTmp=true
-ProtectSystem=strict
-ReadWritePaths=/home/debian/aitbc
-
-[Install]
-WantedBy=multi-user.target

systemd/aitbc-gpu-miner.service.d/10-central-env.conf

@@ -1,2 +0,0 @@
-[Service]
-EnvironmentFile=/opt/aitbc/.env

systemd/aitbc-gpu-multimodal.service

@@ -1,37 +0,0 @@
-[Unit]
-Description=AITBC GPU Multi-Modal Processing Service
-After=network.target aitbc-coordinator-api.service
-Wants=aitbc-coordinator-api.service
-
-[Service]
-Type=simple
-User=debian
-Group=debian
-WorkingDirectory=/home/oib/aitbc/apps/coordinator-api
-Environment=PATH=/usr/bin
-Environment=CUDA_VISIBLE_DEVICES=0
-ExecStart=/usr/bin/python3 -m uvicorn src.app.services.gpu_multimodal_app:app --host 127.0.0.1 --port 8003
-ExecReload=/bin/kill -HUP $MAINPID
-KillMode=mixed
-TimeoutStopSec=5
-PrivateTmp=true
-Restart=on-failure
-RestartSec=10
-
-# Logging
-StandardOutput=journal
-StandardError=journal
-SyslogIdentifier=aitbc-gpu-multimodal
-
-# Security
-NoNewPrivileges=true
-ProtectSystem=strict
-ProtectHome=true
-ReadWritePaths=/home/oib/aitbc/apps/coordinator-api
-
-# GPU Access
-DeviceAllow=/dev/nvidia0 rwm
-DevicePolicy=auto
-
-[Install]
-WantedBy=multi-user.target

systemd/aitbc-gpu-multimodal.service.d/10-central-env.conf

@@ -1,2 +0,0 @@
-[Service]
-EnvironmentFile=/opt/aitbc/.env

systemd/aitbc-gpu-registry.service

@@ -1,21 +0,0 @@
-[Unit]
-Description=AITBC GPU Registry Demo
-After=network.target
-Wants=network.target
-
-[Service]
-Type=simple
-User=aitbc
-Group=aitbc
-WorkingDirectory=/opt/aitbc/apps/gpu-miner
-Environment=PATH=/usr/bin
-Environment=PYTHONPATH=/opt/aitbc/apps/gpu-miner
-ExecStart=/usr/bin/python3 /opt/aitbc/dev/gpu/gpu_registry_demo.py
-Restart=always
-RestartSec=10
-StandardOutput=journal
-StandardError=journal
-SyslogIdentifier=aitbc-gpu-registry
-
-[Install]
-WantedBy=multi-user.target