🧹 [Extract cryptographic functions]

[Tcode-Motion]

🎯 What: Extracted the inline cryptographic closures (aes_encrypt, aes_decrypt, bcrypt_hash, and bcrypt_verify) in stdlib/src/crypto.rs into standalone, top-level helper functions.

💡 Why: The original register_crypto function was very large and contained deeply nested closures with self-contained logic. Extracting these into separate functions significantly improves readability and makes the registry setup cleaner and easier to maintain, without altering any functionality.

✅ Verification: Verified the exact same logic was extracted and confirmed that the original performance optimizations (such as hex::encode) were preserved. Ran cargo check and cargo test in the workspace to ensure no regressions were introduced. Note that preexisting unrelated build errors on master (e.g. bincode, ureq, rand) still exist.

✨ Result: A much cleaner register_crypto function that simply delegates to dedicated helper functions, improving overall code health and maintainability.

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PR created automatically by Jules for task 2408439689701466053 started by @Tcode-Motion

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