Add --config option to dmf-get for command-line configuration file specification

[Copilot]

Configuration files could only be specified in .dmd dependency files, not directly on the command line when downloading single modules.

Changes

New command-line options:

• --config <path> - Configuration file path to copy from module package
• --config-dest <name> - Optional custom destination filename

Validation:

• --config requires --config-dir
• Mutually exclusive with -d/--dependencies (use .dmd syntax instead)
• Not applicable to headers or docs commands

Implementation:

• Reuses existing CopyConfigurationFile() function after successful module installation
• Supports variable substitution via -D flag
• Configuration file lookup follows same logic as .dmd entries (checks .dmr, falls back to default location)

Usage

# Basic usage
dmf-get dmclk@0.4 --config board/stm32f746g-disco.ini --config-dir ./config

# Custom destination name
dmf-get mymodule --config mcu/cfg.ini --config-dir ./cfg --config-dest my.ini

# With variable substitution
dmf-get mymodule --config boards/${BOARD}/cfg.ini --config-dir ./config -D BOARD=stm32f7

Copies configuration to <config-dir>/<module>/<filename> by default, or <config-dir>/<custom-name> when --config-dest is specified.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Dodać możliwość podania konfiguracji do pobrania w dmf-get z cmd</issue_title>
<issue_description>Aktualnie w dmf-get w plikach *.dmd można podać nazwę konfiguracji do przekopiowania - chciałbym aby była podobna możliwość przy wykorzystywaniu dmf-get bez dmd - czyli po prostu z wiersza komend. Czyli np jak piszę:

dmf-get dmclk@0.4
żebym mogł jeszcze dodać jakoś nazwę konfiguracji do pobrania, np:

dmf-get dmclk@0.4 board/stm32f746g-disco.ini</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Dodać możliwość podania konfiguracji do pobrania w dmf-get z cmd #203

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