fix: multiple bugs across shell, lua and python modules

Shell (ruantiblock):
- fix broken 'ip' command check — was 'export IP_CMD=ip' followed
  by checking $? (always 0 from export); now uses 'which ip' like
  other utility checks
- fix LOGGER_CMD check — export swallowed which exit code; split
  assignment and export
- fix 'return 1' outside function in main case block — changed to
  'exit 1'
- fix '==' to '=' in test expressions for POSIX sh compliance
  (script uses #!/bin/sh)
- fix typo 'Искоючить' -> 'Исключить' in comment
- remove unused variable _dnsmasq_data_file in AddUserEntries()

Lua (ruab_parser.lua):
- fix global variable leak: 'val' in Config:load_environ_config()
  was not declared local, polluting global scope
- fix global function leak: 'load_file' inside
  Config:load_filter_files() was not declared local
- fix premature return in Summarize.remove_items() — only first
  matching item was deleted from range, rest were skipped

Python (ruab_parser.py):
- fix AttributeError crash in Summarize._group_ip_ranges() —
  raw_list is a dict but .remove() was called (dict method);
  changed to .pop() with default None

ruantiblock-mod-lua/files/usr/libexec/ruantiblock/ruab_parser.lua

@@ -153,7 +153,7 @@ end
 function Config:load_environ_config()
     local cfg_table = {}
     for var in pairs(self.environ_table) do
-        val = os.getenv(var)
+        local val = os.getenv(var)
         if val then
             cfg_table[var] = val
         end
@@ -234,7 +234,7 @@ end
 -- Loading filters
 
 function Config:load_filter_files()
-    function load_file(file, t, is_array, func)
+    local function load_file(file, t, is_array, func)
         local file_handler = io.open(file, "r")
         if file_handler then
             for line in file_handler:lines() do
@@ -604,11 +604,11 @@ function Summarize:_group_ip_ranges(ip_list, raw_list)
         for i = start, stop do
             if raw_list[i] then
                 raw_list[i] = nil
-                return
-            end
-            local item = it.int_to_ip(i)
-            if raw_list[item] then
-                raw_list[it.int_to_ip(i)] = nil
+            else
+                local item = it.int_to_ip(i)
+                if raw_list[item] then
+                    raw_list[item] = nil
+                end
             end
         end
     end