Fix caveats replacing order (HOMEBREW_PREFIX) in API formula reconstruction

[umireon]

$HOMEBREW_PREFIX prefiexed with / (e.g. unix://$HOMEBREW_PREFIX) results in broken path.
This is because /$HOME is replaced before $HOMEBREW_PREFIX in API.
This PR fixes the order of replacing HOMEBREW_PREFIX, HOMEBREW_CELLAR, HOME.

Actual behavior

% brew info socktainer
==> socktainer ✔: stable 1.0.0 (bottled), HEAD
Docker-compatible REST API on top of Apple container
https://socktainer.github.io
Installed (on request)
From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/s/socktainer.rb
License: Apache-2.0
==> Installed Kegs and Versions
socktainer ✔ HEAD-21af0b5 (7 files, 68.6MB) [Linked]
==> Dependencies
Required (1): container ✔
Recursive Runtime (1): all installed ✔
==> Options
--HEAD
	Install HEAD version
==> Caveats
Socktainer exposes a Docker-compatible REST API. You can connect any tools you installed for Docker daemon.

To connect it to your tools, add the following to ~/.bash_profile or ~/.zshrc:
  export DOCKER_HOST=unix://Users/umireonBREW_PREFIX/var/run/socktainer/.socktainer/container.sock

To restart socktainer after an upgrade:
  brew services restart socktainer
Or, if you don't want/need a background service you can just run:
  HOME="/opt/homebrew/var/run/socktainer" /opt/homebrew/opt/socktainer/bin/socktainer
==> Analytics
install: 14 (30 days), 29 (90 days), 29 (365 days)
install-on-request: 14 (30 days), 29 (90 days), 29 (365 days)
build-error: 0 (30 days)

Expected behavior

To connect it to your tools, add the following to ~/.bash_profile or ~/.zshrc:
  export DOCKER_HOST=unix:///opt/homebrew/var/run/socktainer/.socktainer/container.sock

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• AI was used to generate or assist with generating this PR.

I used OpenAI Codex to investigate the root cause of this bug. I wrote all the code by my hands and carefully examined thoroughly. I have run test and actual command repeatedly to confirm this change works as expected.

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[umireon]

Waiting for initial test case failure

[umireon]

Test passed. I'm confident with this PR to fix the bug.

[Copilot]

Pull request overview

This PR fixes a placeholder-replacement ordering issue when reconstructing Formula data from the API, preventing $HOMEBREW_PREFIX (and $HOMEBREW_CELLAR) from being partially rewritten by the /$HOME placeholder replacement in strings like unix://$HOMEBREW_PREFIX.

Changes:

• Reorder placeholder substitutions in APIHashable#deep_remove_placeholders to replace prefix/cellar before home.
• Add an RSpec regression test ensuring unix://$HOMEBREW_PREFIX is reconstructed correctly in FormulaStruct.from_hash.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
Library/Homebrew/api_hashable.rb	Fixes placeholder replacement order to avoid /$HOME matching inside /$HOMEBREW_PREFIX//$HOMEBREW_CELLAR.
Library/Homebrew/test/api/formula_struct_spec.rb	Adds a regression test covering the previously broken unix://$HOMEBREW_PREFIX caveats reconstruction case.

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