node: fix node-exe startup crashes in the CLI parser

[fpelliccioni]

The node executable crashed on any run that loads a config file (the normal path), before doing any work. Three CLI11 issues in parser.cpp:

• --help,-h duplicate — added on top of CLI11's built-in help flag → OptionAlreadyAdded: h is already added. Fixed by clearing the built-in with set_help_flag() before registering ours.
• config duplicate — the config-file reload pass called set_config("--config", …), colliding with the already-registered --config,-c → OptionAlreadyAdded: config is already added. Fixed with a distinct internal loader name.
• Segfault — that reload pass called app.parse(0, nullptr); CLI11 dereferences argv[0], so a null argv segfaults. Fixed by passing a valid program-name argv.

With these, kth -r -n mainnet -c <file> starts and runs IBD (verified).

[coderabbitai]

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