feat: Phase 6 - Docker, systemd, and installation scripts

systemd/companion-index@.service

@@ -0,0 +1,22 @@
+[Unit]
+Description=Companion AI Full Index (One-shot)
+Documentation=https://github.com/santhoshjan/companion
+
+[Service]
+Type=oneshot
+User=companion
+Group=companion
+WorkingDirectory=/opt/companion
+Environment=PYTHONPATH=/opt/companion
+Environment=COMPANION_CONFIG=/opt/companion/config.json
+Environment=COMPANION_DATA_DIR=/var/lib/companion
+
+# Run full index
+ExecStart=/opt/companion/venv/bin/python -m companion.indexer_daemon.cli index
+
+# Security hardening
+NoNewPrivileges=true
+PrivateTmp=true
+ProtectSystem=strict
+ProtectHome=true
+ReadWritePaths=/var/lib/companion