Make starship theme environment-specific for nealarch container

[Copilot]

When running inside a nealarch container (NEALARCH=1), the starship prompt should use blue colors instead of green so the environment is immediately visually distinguishable from a normal Arch setup.

Changes

• setup.sh: Extended NEALARCH detection to accept "1" in addition to "true", matching the actual env var convention (NEALARCH=1) documented in nealcontainer
• environments/nealarch/config/.config/starship.toml: New environment-specific starship config with green → blue color substitutions, applied via stow when the nealarch environment is detected

Color mapping (green → blue)

Role	Normal	nealarch
Directory bg	#007854	#003f8c
Git segment bg	#1a6265	#1a3565
Git branch/status fg	#00a86b	#0099ff
Language version fg	#0dbc79	#0d79bc

Original prompt

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This section details on the original issue you should resolve

<issue_title>Make starship theme environment specific</issue_title>
<issue_description>Current theme is applicable to a 'normal' arch distribution, However, running an arch container from nealcontainer should allow the setup script to detect it's inside the container. This can be done by checking for the NEALARCH=1 env variable. When that is the case, instead of the green colors from a normal distro, change it to the equivalent blue, so I can immediately tell what shell I am in.</issue_description>

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

• Fixes Make starship theme environment specific #3

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