feat: standardize llama.cpp backend (#1123)

systemd/llama-server.service

@@ -0,0 +1,29 @@
+[Unit]
+Description=llama.cpp Local LLM Server
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+User=root
+Environment=MODEL_PATH=/opt/models/llama/Qwen2.5-7B-Instruct-Q4_K_M.gguf
+Environment=LLAMA_HOST=0.0.0.0
+Environment=LLAMA_PORT=11435
+Environment=LLAMA_CTX_SIZE=4096
+Environment=LLAMA_THREADS=4
+ExecStart=/usr/local/bin/llama-server -m ${MODEL_PATH} --host ${LLAMA_HOST} --port ${LLAMA_PORT} -c ${LLAMA_CTX_SIZE} -t ${LLAMA_THREADS} --cont-batching
+Restart=on-failure
+RestartSec=10
+MemoryMax=12G
+CPUQuota=90%
+NoNewPrivileges=true
+ProtectSystem=strict
+ProtectHome=read-only
+ReadWritePaths=/opt/models
+PrivateTmp=true
+StandardOutput=journal
+StandardError=journal
+SyslogIdentifier=llama-server
+
+[Install]
+WantedBy=multi-user.target