Adopt HHF Technology stack structure for Pangolin backup and updates

backend/pangolin.py

@@ -157,16 +157,39 @@ async def trigger_pangolin_update() -> Dict[str, Any]:
     
     # Remote update script executed on the VPS
     remote_script = f"""
+eval P_DIR="{p_dir}"
+P_DIR="${{P_DIR/#~/$HOME}}"
+
+# Locate compose directory
+if [ -f "$P_DIR/docker-compose.yml" ] || [ -f "$P_DIR/compose.yaml" ]; then
+    COMPOSE_DIR="$P_DIR"
+elif [ -f "$(dirname "$P_DIR")/docker-compose.yml" ] || [ -f "$(dirname "$P_DIR")/compose.yaml" ]; then
+    COMPOSE_DIR="$(dirname "$P_DIR")"
+else
+    COMPOSE_DIR="$P_DIR"
+fi
+
 echo "=== STEP 1: Connecting to Pangolin VPS ({vps_host}) ==="
-cd "{p_dir}" || exit 1
+echo "Operating Directory: $COMPOSE_DIR"
+cd "$COMPOSE_DIR" || exit 1
+
+# Detect docker compose version
+if docker compose version >/dev/null 2>&1; then
+    DC="docker compose"
+elif command -v docker-compose >/dev/null 2>&1; then
+    DC="docker-compose"
+else
+    echo "ERROR: Neither 'docker compose' nor 'docker-compose' found on VPS."
+    exit 1
+fi
 
 echo ""
 echo "=== STEP 2: Pulling latest images on VPS ==="
-docker compose pull
+$DC pull
 
 echo ""
 echo "=== STEP 3: Applying stack updates & recreating containers ==="
-docker compose up -d --remove-orphans
+$DC up -d --remove-orphans
 
 echo ""
 echo "=== STEP 4: Verifying running container status ==="