Delete BaseIdeSetup class and merge surviving members into
ConfigDrivenIdeSetup, eliminating the inheritance hierarchy.
Remove unused template system, multi-target support,
installCustomAgentLauncher, and vestigial config keys
(template_type, skill_format, artifact_types) from
platform-codes.yaml. Freeze Config instance and arrays.
Move Config class to installers/lib/core/. Remove force flag
from update paths. Convert OfficialModules.collectConfigs to
static build().
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