refactor: rename xray-sub to xtui, optimize selection tracking with index

- Rename project from xray-sub to xtui (app name, state dir, user-agent)
- Add selected_index to config for O(1) saved server lookup
- Add migrate_saved_index() for backward compatibility
- Replace fingerprint-based comparison with index-based in menu and apply

main.sh

@@ -1,8 +1,8 @@
 #!/usr/bin/env bash
 set -Eeuo pipefail
 
-APP_NAME="xray-sub"
-STATE_DIR="${HOME}/.xray-sub"
+APP_NAME="xtui"
+STATE_DIR="${HOME}/.xtui"
 CONFIG_FILE="${STATE_DIR}/config"
 SUB_JSON="${STATE_DIR}/sub.json"
 BACKUP_DIR="${STATE_DIR}/backups"
@@ -135,7 +135,7 @@ write_cfg() {
     --arg sub_url "$sub_url" \
     --arg xray_config "$xray_config" \
     --arg service "$service" \
-    '{sub_url:$sub_url, xray_config:$xray_config, service:$service, selected_fp:"", selected_name:""}' >"$tmp"
+    '{sub_url:$sub_url, xray_config:$xray_config, service:$service, selected_index:"", selected_fp:"", selected_name:""}' >"$tmp"
   install -m 600 "$tmp" "$CONFIG_FILE"
   rm -f "$tmp"
 }
@@ -163,7 +163,7 @@ fetch_subscription() {
   info "Скачиваю подписку…"
   if ! curl -fLsS --connect-timeout 10 --max-time 45 --retry 2 --retry-delay 1 \
       -H 'Accept: application/json, */*' \
-      -A 'xray-sub-selector/1.2' \
+      -A 'xtui/1.2' \
       "$url" -o "$tmp"; then
     rm -f "$tmp"
     return 1
@@ -332,21 +332,36 @@ profile_fingerprint() {
 }
 
 find_saved_index() {
-  local saved_fp count i fp
+  local saved_index saved_fp count i fp
+  saved_index="$(cfg_get selected_index)"
   saved_fp="$(cfg_get selected_fp)"
   count="$(profile_count)"
-  [[ -n "$saved_fp" ]] || { echo 0; return; }
 
-  for ((i=0; i<count; i++)); do
-    fp="$(profile_fingerprint "$i")"
-    if [[ "$fp" == "$saved_fp" ]]; then
-      echo "$i"
-      return
-    fi
-  done
+  if [[ "$saved_index" =~ ^[0-9]+$ ]] && (( saved_index < count )); then
+    echo "$saved_index"
+    return
+  fi
+
+  if [[ -n "$saved_fp" ]]; then
+    for ((i=0; i<count; i++)); do
+      fp="$(profile_fingerprint "$i")"
+      if [[ "$fp" == "$saved_fp" ]]; then
+        cfg_set selected_index "$i"
+        echo "$i"
+        return
+      fi
+    done
+  fi
+
   echo 0
 }
 
+migrate_saved_index() {
+  [[ -s "$SUB_JSON" ]] || return 0
+  validate_subscription_file "$SUB_JSON" || return 0
+  find_saved_index >/dev/null
+}
+
 build_selected_config() {
   local idx="$1" out="$2"
   jq -e --argjson i "$idx" "${PROFILES_DEF}"'
@@ -418,10 +433,10 @@ restart_xray_service() {
 }
 
 apply_selection() {
-  local idx="$1" dest service tmp fp old_fp name proto addr port changed=1 service_state
+  local idx="$1" dest service tmp fp old_index name proto addr port changed=1 service_state
   dest="$(cfg_get xray_config)"
   service="$(cfg_get service)"
-  old_fp="$(cfg_get selected_fp)"
+  old_index="$(cfg_get selected_index)"
   fp="$(profile_fingerprint "$idx")"
   IFS=$'\t' read -r name proto addr port < <(profile_summary "$idx")
 
@@ -444,12 +459,13 @@ apply_selection() {
     ok "В ${dest} уже записан этот конфиг: ${name}"
   fi
 
+  cfg_set selected_index "$idx"
   cfg_set selected_fp "$fp"
   cfg_set selected_name "$name"
   rm -f "$tmp"
 
   service_state="$(service_state_raw "$service")"
-  if (( changed )) || [[ "$old_fp" != "$fp" ]]; then
+  if (( changed )) || [[ "$old_index" != "$idx" ]]; then
     if [[ "$service_state" == "active" || "$service_state" == "activating" ]]; then
       restart_xray_service "$service"
     else
@@ -622,17 +638,16 @@ render_table_header() {
 }
 
 render_profile_row() {
-  local idx="$1" cursor="$2" saved_fp="$3"
-  local fp name proto addr port pointer mark row_style name_short addr_short
+  local idx="$1" cursor="$2" saved_index="$3"
+  local name proto addr port pointer mark row_style name_short addr_short
 
   IFS=$'\t' read -r name proto addr port < <(profile_summary "$idx")
-  fp="$(profile_fingerprint "$idx")"
 
   pointer=" "
   mark=" "
   row_style=""
   [[ "$idx" -eq "$cursor" ]] && { pointer="➤"; row_style="$C_INV"; }
-  [[ -n "$saved_fp" && "$fp" == "$saved_fp" ]] && mark="✓"
+  [[ "$saved_index" =~ ^[0-9]+$ && "$idx" -eq "$saved_index" ]] && mark="✓"
 
   name_short="$(shorten "$name" 31)"
   addr_short="$(shorten "$addr" 20)"
@@ -646,11 +661,11 @@ render_profile_row() {
 }
 
 render_menu() {
-  local cursor="$1" count saved_fp i cache_info selected_name
+  local cursor="$1" count saved_index i cache_info selected_name
   local service service_state service_enabled xray_config socks_endpoint
 
   count="$(profile_count)"
-  saved_fp="$(cfg_get selected_fp)"
+  saved_index="$(cfg_get selected_index)"
   selected_name="$(cfg_get selected_name)"
   service="$(cfg_get service)"
   xray_config="$(cfg_get xray_config)"
@@ -676,7 +691,7 @@ render_menu() {
 
   render_table_header
   for ((i=0; i<count; i++)); do
-    render_profile_row "$i" "$cursor" "$saved_fp"
+    render_profile_row "$i" "$cursor" "$saved_index"
   done
 }
 
@@ -777,6 +792,7 @@ main() {
       ;;
     --refresh)
       cfg_exists || wizard
+      migrate_saved_index
       fetch_subscription "$(cfg_get sub_url)" || die "Не удалось обновить подписку."
       exit 0
       ;;
@@ -789,6 +805,7 @@ main() {
       ;;
   esac
 
+  migrate_saved_index
   maybe_refresh_subscription "$(cfg_get sub_url)"
   validate_subscription_file "$SUB_JSON" || die "Кэш подписки повреждён: ${SUB_JSON}. Запустите ${0##*/} --refresh"
   menu