chore: update rand crate to 0.10.1

[pullfrog]

What changed

• Updated rand to 0.10.1 in both workspace crates
• Regenerated Cargo.lock for the new dependency graph
• Migrated code to the rand 0.10 APIs:
  • thread_rng -> rng
  • distributions -> distr
  • OsRng -> SysRng for local random byte generation
  • fill -> try_fill_bytes with explicit error handling
• Kept RSA encryption compatibility by using rsa::rand_core::OsRng
• Restored deterministic steamguard test RNG behavior with a rand 0.8 dev dependency alias (rand_08) for the existing StepRng based test vectors

Validation

• cargo test
• cargo test -p steamguard

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[pullfrog]

Addressed the requested change by removing the extra rand 0.8 dev dependency and replacing test usage with a local deterministic RNG implemented against rsa::rand_core. Ran cargo test -p steamguard test_encrypt_password -- --nocapture successfully, pushed two commits to pullfrog/0-update-rand-crate, replied to the review comment, and resolved the thread.

Task list (6/6 completed)

• Checkout PR chore: update rand crate to 0.10.1 #492 branch
• Fetch review comments for review 4106223940
• Implement requested code changes
• Run quality checks and commit
• Push branch, reply to comments, resolve threads
• Report final progress

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