fix: clear inherited admin password in smoke test

[jianneng-fit2cloud]

The real-model smoke script generates its own temporary password hash. If LAYA_ADMIN_PASSWORD is already exported, both password settings are present and configuration validation stops the script before it can run.

Clear the inherited plaintext password before setting the smoke-test hash. This adds one line to scripts/smoke-real-model.py and only affects the smoke-test process.

Validation:

• Reproduced the original configuration failure with an inherited plaintext password.
• Verified configuration setup with absent, empty, plaintext, and hash-only password environments.
• Existing backend suite: 5 passed.
• Full model inference was not run because local model checkpoints are unavailable.

[Copilot]

Copilot review overview

🟢 Approval recommended

The focused change resolves the configuration conflict.

Review effort: Lite
Findings: None

What changed in this PR

Fixes the smoke test by clearing an inherited plaintext admin password before setting its generated hash.

Changes:

• Removes LAYA_ADMIN_PASSWORD from the smoke-test environment.

File	Summary
scripts/​smoke-real-model.py	Prevents conflicting password environment settings.

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