refactor(config): separate config dir from data dir on unix

[skevetter]

Unix path managers resolved ConfigDir and DataDir to the same ~/.devsy
path, so config.yaml piled into the data root alongside contexts and
bind-mount sources. Move ConfigDir to ~/.config/devsy, matching Windows'
already-distinct layout. DataDir/StateDir/CacheDir are unchanged.

Also unify the pm self-reference assignment (pm.pm = pm) across darwin
and windows to match linux and clear the staticcheck finding.

Summary by CodeRabbit

• Bug Fixes
  • Standardized default config and config file locations on macOS and Linux to use the common ~/.config/<AppName> path.
  • Updated Windows path initialization to ensure path resolution works correctly across platforms.
• Tests
  • Added and updated platform-specific tests to verify config, data, and config file paths resolve as expected.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 9482441a-3aeb-4eab-8cb1-4740386d11b6

📥 Commits

Reviewing files that changed from the base of the PR and between 316bfe6 and 4517bfe.

📒 Files selected for processing (5)

• pkg/config/pathmanager_darwin.go
• pkg/config/pathmanager_darwin_test.go
• pkg/config/pathmanager_linux.go
• pkg/config/pathmanager_linux_test.go
• pkg/config/pathmanager_windows.go

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📝 Walkthrough

Walkthrough

This PR changes ConfigDir() resolution on Darwin and Linux to use the XDG-style ~/.config/<RepoName> path instead of ~/.<RepoName>, adjusts pm back-reference assignment in Darwin and Windows constructors, and updates/adds corresponding tests.

Changes

XDG Config Directory Migration

Layer / File(s)	Summary
Darwin ConfigDir path and constructor fix pkg/config/pathmanager_darwin.go, pkg/config/pathmanager_darwin_test.go	ConfigDir() now resolves to ~/.config/<RepoName> instead of ~/.<RepoName>, newPlatformPathManager assigns pm.pm directly, and new tests validate ConfigDir(), DataDir(), and ConfigFilePath() behavior.
Linux ConfigDir path change pkg/config/pathmanager_linux.go, pkg/config/pathmanager_linux_test.go	ConfigDir() now joins home with .config and RepoName instead of "."+RepoName, with test expectations updated accordingly.
Windows constructor field assignment fix pkg/config/pathmanager_windows.go	newPlatformPathManager assigns pm.pm directly instead of pm.basePathManager.pm.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• devsy-org/devsy#74: Both PRs modify the pkg/config PathManager implementations, specifically the newPlatformPathManager wiring and ConfigDir() location logic.
• devsy-org/devsy#416: Both PRs modify pkg/config/pathmanager_darwin.go's HOME-based ConfigDir()/DataDir() path resolution.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: Unix config paths are separated from data paths.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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