chore(ci): guard against password handlers that skip base64-decode

[cristim]

Closes #661. Refs #357 (the regression this guards against).

Approach

AST-based source scanner test (internal/api/base64_password_guard_test.go) that runs as a standard go test case. No external tooling, no new pre-commit hook.

How it works

TestBase64PasswordGuard scans all non-test .go files under internal/api. For each function that both:

1. Contains a json.Unmarshal call, AND
2. Reads any field whose name ends in Password

the test asserts that function also calls decodeBase64Password or the known delegate helper decodeChangePasswordRequest. Violations report file:function.

A synthetic-regression test (TestBase64PasswordGuard_SyntheticRegression) embeds a deliberately bad handler source string (mirroring the exact #356 shape) and asserts the scanner catches it — proves the guard isn't vacuous.

Verification

• Injected the fix(auth/api): password-reset endpoint forgets to base64-decode new_password — invited users locked out #356 regression (removed decodeBase64Password call from resetPassword) → TestBase64PasswordGuard failed with a precise violation message
• Restored the correct code → both tests pass
• Full go test ./internal/api/: 1233 tests pass
• go vet clean, golangci-lint clean on the new file

Exemptions

setupAdmin is the only function in knownExemptFunctions with a documented justification comment. Future additions require an explicit reason.

Summary by CodeRabbit

• Tests
  • Added test infrastructure to detect potential password handling regressions, ensuring proper security practices are maintained across the codebase.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 8fcb2319-9f7d-4a8b-8b5d-a278668ff832

📥 Commits

Reviewing files that changed from the base of the PR and between 5abf40b and b97e814.

📒 Files selected for processing (1)

• internal/api/base64_password_guard_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/661-base64-decode-guard

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