test(scripts): add bats coverage for setup-email.sh password helpers

`setup-email.sh' ran top to bottom, so the only way to exercise `install_encrypted_password' / `decrypt_password' was to run the whole new-machine setup (mbsync, mu init). Its procedural body now lives in a `main()' function guarded by the usual `[[ "${BASH_SOURCE[0]}" == "${0}" ]]' check, so sourcing the script just defines the helpers, and running it directly is unchanged.

New `tests/test-setup-email.bats' sources the script, points the password dirs at a per-test tmpdir, and covers both helpers across the normal / skip-existing / missing-source / (for decrypt) gpg-failure paths, stubbing `gpg' so no real key is needed. `make test-bash' runs the bats files, and `make test' picks them up after the Elisp suite when bats is installed.

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