chore: bump rand 0.10 and rand_distr 0.6 with API migration

[Ayyankhan101]

Summary

• Bump direct deps: rand 0.9 → 0.10.2, rand_distr 0.5 → 0.6.0
• Migrate for rand 0.10: Rng → RngExt, StdRng::from_os_rng() → rand::make_rng::<StdRng>()
• candle-core keeps its own rand 0.9 / rand_distr 0.5 (dual versions in the lockfile)

Supersedes Dependabot #18 and #24.

Test plan

• cargo test --features server
• cargo clippy --all-targets --all-features -- -D warnings

[git-mind-pr-guardian]

GitMind PR Review

{'pr_url': '#26', 'repo': 'Ayyankhan101/Transformer-In-Rust', 'pr_num': '26', 'title': 'chore: bump rand 0.10 and rand_distr 0.6 with API migration', 'author': 'Ayyankhan101', 'additions': 101, 'deletions': 29, 'changed_files': 8, 'review': '## Summary\nAutomatic review could not be generated — please review the diff manually.\n\n## Issues\nNo significant issues found.\n\n## Verdict\n💬 NEEDS DISCUSSION\nThe automated review failed; human review required.'}

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