fix: multiple bugs across shell, lua and python modules

[toxeh]

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