fix: refactor cli output-path resolution out of the core layout model

[cdsap]

Summary

Problem

project-generator/src/main/kotlin/io/github/cdsap/projectgenerator/model/ProjectLayout.kt contains defaultRootPath, including the CLI-specific projects_generated/<projectName> convention. cli/src/main/kotlin/io/github/cdsap/projectgenerator/cli/GenerateProjectRequest.kt calls this core-model function while assembling a CLI request.

Why this matters

The published generator core is coupled to a CLI filesystem convention, making output policy harder to reuse or test independently. It also mixes two boundaries in ProjectLayout: core language-specific layout attributes and CLI default-directory selection.

Proposed change

Move defaultRootPath into a small CLI-owned ProjectOutputPathResolver and update GenerateProjectRequest.resolve to use it. Keep ProjectLayout.languageAttributes unchanged for the generator's internal layout behavior.

Notes

This is a small dependency-direction improvement: the CLI chooses its delivery/output policy, while the core generator retains only layout behavior needed to generate a project. The change follows a clean-architecture boundary without introducing a new framework or broader redesign.

Fixes #480

Changes

• cli/src/main/kotlin/io/github/cdsap/projectgenerator/cli/GenerateProjectRequest.kt
• cli/src/main/kotlin/io/github/cdsap/projectgenerator/cli/ProjectOutputPathResolver.kt
• cli/src/test/kotlin/io/github/cdsap/projectgenerator/cli/GenerateProjectsCliTest.kt
• project-generator/src/main/kotlin/io/github/cdsap/projectgenerator/model/ProjectLayout.kt
• project-generator/src/test/kotlin/io/github/cdsap/projectgenerator/model/ProjectLayoutTest.kt

Verification

• ./gradlew :project-generator:unitTest
• ./gradlew :cli:test
• ./gradlew ktlintCheck