The codebase had inconsistent endianness: bytes() used little-endian while Display (Base64) and serde used big-endian.

Changes

• Display trait: Changed to_be_bytes() → to_le_bytes() for Base64 encoding
• Serde deserialization: Changed from_be_bytes() → from_le_bytes() for Base64 decoding
• Tests: Updated expected Base64 string and added verification test

Breaking Change

Base64 representation changes for the same FlakeId value:

let id = Flake::new(29866156537351941961353716432896);
println!("{}", id);
// Before: AAABePbBqL900Cue9CYAAA== (big-endian)
// After:  AAAm9J4r0HS/qMH2eAEAAA== (little-endian)

Systems storing or comparing Base64 representations will need to handle the migration.

• Fixes Inconsistent endianness #11

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