[fix](cli): keep "1" and "0" as integers in kt config set

[Dev-next-gen]

What does this PR do?

While reading the kt CLI I noticed that kt config set stores 1 and 0 as booleans. _parse_value() in kt-kernel/python/cli/commands/config.py checks the boolean words before it tries int(), and "1"/"0" are in that list, whereas "2" goes on to become the integer 2.

Where this hurts is environment variables. After

kt config set advanced.env.CUDA_VISIBLE_DEVICES 1

the config file contains CUDA_VISIBLE_DEVICES: true, Settings.get_env_vars() stringifies it, and kt run hands sglang CUDA_VISIBLE_DEVICES=True instead of 1. The same goes for OMP_NUM_THREADS 1 or any inference.env.* value set to 1 or 0. I reproduced this on current main by calling _parse_value() and Settings against a temporary config file. I did not launch sglang itself (no NVIDIA GPU on the machine I used), so the last step, CUDA rejecting True as a device list, is what I expect rather than something I watched happen.

The change drops "1" and "0" from the boolean words so they fall through to the integer parse. true/false/yes/no/on/off still give booleans, and 0/1 keep the same truthiness, so anything that does if settings.get(...) behaves as before. I grepped the CLI for is True/== True style checks on settings values and found none.

The new CPU test kt-kernel/test/per_commit/test_config_parse_value.py fails on main with

AssertionError: {'CUDA_VISIBLE_DEVICES': 'True'} != {'CUDA_VISIBLE_DEVICES': '1'}
AssertionError: <class 'bool'> is not <class 'int'> : 0

and passes with the change. The boolean-word test passes on both sides. The test writes nothing outside its temporary directory. I ran it without building the extension, through a bare kt_kernel package that only links python/cli, so it has not been through the kt-cpu runner yet. I also didn't have black installed; the new lines stay under the 120-column limit.

No issue filed for this one.

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