ksud: fix some module scripts won't add KSU_MODULE environment var

[AlexLiuDev233]

KSU_MODULE environment var will only pass in exec_script, that's cause only stage-scripts, action.sh and uninstall scripts have this environment var

So, it cause customize.sh, and meta*.sh won't have this envionment var
And module developers will see them can't use ksud module config set command,
because ksud throw
This command must be run in the context of a module or passed --internal <name>

Taking the magic_mount_rs module as an example:
before:

KSU='true'
KSU_KERNEL_VER_CODE='32481'
KSU_VER='3.2.4-24-gcc83433b'
KSU_VER_CODE='32481'

after:

KSU='true'
KSU_KERNEL_VER_CODE='32481'
KSU_MODULE='magic_mount_rs'
KSU_VER='3.2.4-24-gcc83433b'
KSU_VER_CODE='32481'

[Copilot]

Pull request overview

This PR updates ksud’s script execution environment handling so module-related scripts consistently receive the KSU_MODULE environment variable (not just scripts launched through exec_script), enabling module scripts like customize.sh / meta*.sh to use module-scoped commands (e.g., module config operations) without requiring --internal.

Changes:

• Refactors get_common_script_envs() to accept an optional module_id and inject KSU_MODULE when available/valid.
• Ensures installer execution (exec_install_script) propagates KSU_MODULE by passing the installing module’s id into the common env set.
• Updates metamodule script execution to pass a metamodule id into the common env set.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
userspace/ksud/src/module.rs	Refactors common script env generation to optionally include KSU_MODULE, and wires it into install script execution and exec_script().
userspace/ksud/src/metamodule.rs	Adds metamodule id helper and passes an id into common envs for metamodule-run scripts.

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