feat(benchmark): Add UDP mode tests to network benchmark

- Add UDP tests for 1, 2, 4 connections
- UDP tests run on LAN and low-loss scenarios
- Skip UDP tests on high packet loss scenarios (not yet supported)
- Include UDP results in comparison table and best calculation

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

benchmark_network.sh

@@ -356,8 +356,55 @@ IFS='|' read -r ms mbs ok <<< "$result"
 RSYNCC_RES=("$ms|$mbs|$ok")
 [ "$ok" -eq 1 ] && ok "${mbs} MB/s (${ms}ms)" || warn "${mbs} MB/s (${ms}ms) FAILED"
 
-# Cleanup network
-cleanup_network
+# UDP tests - only for scenarios without packet loss (UDP doesn't handle loss yet)
+if [ "$PACKET_LOSS" = "0%" ] || [ "$PACKET_LOSS" = "0.1%" ]; then
+    # Re-setup network for UDP tests (UDP doesn't work with tc netem packet loss)
+    cleanup_network
+    setup_network
+    
+    declare -a UDP_RES
+    UDP_LABELS=("fastSyncAI UDP 1 conn" "fastSyncAI UDP 2 conn" "fastSyncAI UDP 4 conn")
+    UDP_CONN_COUNTS=(1 2 4)
+    
+    info "Testing UDP mode (${SCENARIO_NAME})..."
+    
+    for i in "${!UDP_CONN_COUNTS[@]}"; do
+        n=${UDP_CONN_COUNTS[$i]}
+        echo -n "  ${UDP_LABELS[$i]}... "
+        local dst="$DST_DIR_BASE/udp_${n}"
+        local port=$((FASTSYNC_PORT + 100 + n))
+        rm -rf "$dst"
+        mkdir -p "$dst"
+        
+        "$SERVER_BIN" -p "$port" -d "$dst" >/dev/null 2>&1 &
+        local spid=$!
+        sleep 1
+        
+        local output
+        output=$(timeout 600 "$CLIENT_BIN" -h "$HOST" -p "$port" -s "$SRC_DIR" -n "$n" -u 2>&1) || true
+        
+        local ms=$(echo "$output" | grep -oP 'ms=\K[0-9.]+' || echo "0")
+        local mbs=$(echo "$output" | grep -oP 'throughput_mbs=\K[0-9.]+' || echo "0")
+        local ok=1
+        verify "$SRC_DIR" "$dst" || ok=0
+        echo "${ms}|${mbs}|${ok}"
+        UDP_RES+=("${ms}|${mbs}|${ok}")
+        [ "$ok" -eq 1 ] && ok "${mbs} MB/s (${ms}ms)" || warn "${mbs} MB/s (${ms}ms) FAILED"
+        
+        kill "$spid" 2>/dev/null || true
+        wait "$spid" 2>/dev/null || true
+        sync
+        sleep 1
+        rm -rf "$dst"
+    done
+    
+    cleanup_network
+else
+    warn "Skipping UDP tests (packet loss scenarios not yet supported for UDP)"
+fi
+
+# Re-setup network for final TCP results display
+setup_network
 
 echo ""
 echo -e "${BOLD}═══════════════════════════════════════════════════════════════════════════╗${RESET}"
@@ -369,7 +416,7 @@ echo ""
 # Calculate max for scaling
 calc_max() {
     local max=0
-    for res in "${FS_RES[@]}" "${RSYNC_RES[@]}" "${RSYNCC_RES[@]}"; do
+    for res in "${FS_RES[@]}" "${RSYNC_RES[@]}" "${RSYNCC_RES[@]}" "${UDP_RES[@]:-}"; do
         local mbs=$(echo "$res" | cut -d'|' -f2)
         local int=$(echo "$mbs" | awk '{printf "%d", $1+0}')
         [ "$int" -gt "$max" ] 2>/dev/null && max=$int
@@ -389,6 +436,16 @@ for i in "${!FS_RES[@]}"; do
     printf "  %-22s  %-10s  %-10s  %s %s\n" "${FS_LABELS[$i]}" "$ms" "$mbs" "$bar" "$v"
 done
 
+# UDP results
+if [ ${#UDP_RES[@]} -gt 0 ]; then
+    for i in "${!UDP_RES[@]}"; do
+        IFS='|' read -r ms mbs ok <<< "${UDP_RES[$i]}"
+        bar=$(draw_bar "$mbs" "$MAX_MBS")
+        v=$([ "$ok" -eq 1 ] && echo "✓" || echo "✗")
+        printf "  %-22s  %-10s  %-10s  %s %s\n" "${UDP_LABELS[$i]}" "$ms" "$mbs" "$bar" "$v"
+    done
+fi
+
 IFS='|' read -r ms mbs ok <<< "${RSYNC_RES[0]}"
 bar=$(draw_bar "$mbs" "$MAX_MBS")
 v=$([ "$ok" -eq 1 ] && echo "✓" || echo "✗")
@@ -415,6 +472,15 @@ for i in "${!FS_RES[@]}"; do
 done
 best_label="${FS_LABELS[$best_idx]}"
 
+# Also check UDP results
+if [ ${#UDP_RES[@]} -gt 0 ]; then
+    for i in "${!UDP_RES[@]}"; do
+        this_mbs=$(echo "${UDP_RES[$i]}" | cut -d'|' -f2 | awk '{printf "%d", $1+0}')
+        [ "$this_mbs" -gt "$best_mbs" ] && best_mbs=$this_mbs && best_idx=$i && best_is_udp=1
+    done
+    [ "$best_is_udp" = "1" ] && best_label="${UDP_LABELS[$best_idx]}"
+fi
+
 IFS='|' read -r rs_ms rs_mbs rs_ok <<< "${RSYNC_RES[0]}"
 rs_mbs_int=$(echo "$rs_mbs" | awk '{printf "%d", $1+0}')