test(anthropic): isolate credential store home lookup

[lalalune]

Summary

• isolates the Anthropic credential-store tests from real ~/.eliza app-managed credentials by pointing HOME and USERPROFILE at the test temp state dir
• preserves and restores the original environment values after each test

Evidence

• bun run --cwd plugins/plugin-anthropic test
• bunx @biomejs/biome check plugins/plugin-anthropic/__tests__/credential-store.test.ts
• git diff --check origin/develop...HEAD

Follow-up to #12793 / refs #12271.

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