fix(server): validate auth commitments against initial account state

[HiteshMittal07]

Overview
Ensures that the cosigner_commitments provided during account initialization exactly match the actual state of the account.

Changes

• Validation Logic: Extracts expected auth configuration from the initial_state and compares it against the client-provided auth.
• Security Fix: Rejects the configuration request if there is a mismatch, preventing the storage of unauthorized or incorrect signer lists in metadata.
• Tests: Added test_configure_account_auth_mismatch and updated existing service tests to verify the enforcement of this consistency check.

Verification
Verified via unit tests: cargo test services::configure_account::tests (All 4 tests passed).

Fixes #102

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[HiteshMittal07]

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