fix(config): setup DEVSY_HOME / --home in PathManager

[skevetter]

Summary

--home and \$DEVSY_HOME had no effect — provider/workspace data always resolved under ~/.devsy (issue #672).

The PathManager refactor (#74) moved path computation into per-OS implementations whose ConfigDir/DataDir/CacheDir/StateDir/RuntimeDir methods call os.UserHomeDir() and never consult DEVSY_HOME. The original GetConfigDir() honored the override by returning it directly as the .devsy root; that behavior was lost.

This adds a shared homeOverrideDir helper and routes the five top-level dir methods on each OS through it: when DEVSY_HOME is set, config/data root at it and cache/state/run sit beneath it; otherwise the OS-native default applies.

Fixes #672.

Verification

• devsy --home /tmp/x/.devsy provider add docker now creates /tmp/x/.devsy with the provider config, independent of ~/.devsy.
• Added TestDevsyHomeOverride / TestDevsyHomeOverrideConfigFilePath.
• go test ./pkg/config/... (26 pass) and ./cmd/... ./pkg/provider/... ./pkg/agent/... (590 pass).

Summary by CodeRabbit

• New Features

  • Added support for overriding the application home directory with the EnvHome environment variable.
  • Configuration, data, cache, state, runtime, and configuration-file paths now resolve under the specified directory across macOS, Linux, and Windows.
  • Required subdirectories are created automatically when an override is used.

• Bug Fixes

  • Ensured custom home-directory settings are consistently honored across all supported platforms.

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[coderabbitai]

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: PathManager now honors DEVSY_HOME and --home overrides.

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