chore: fix 60+ clippy warnings across workspace.

[Bhanudahiyaa]

Summary

Resolves over 60 cargo clippy warnings across the workspace to ensure compliance with the "MoFA Quality Gate".

Motivation

Maintaining a warning-free codebase is required by MoFA's PR guidelines to prevent build regressions and maintain code quality as the ecosystem grows.

Changes

1. mofa-kernel: Resolved collapsible_if and ambiguous_glob_reexports.
2. mofa-foundation: Applied large_enum_variant boxing, type_complexity aliases, and field_reassign_with_default fixes.
3. mofa-integrations: Fixed get_first and collapsible_if in socketio/speech modules.
4. mofa-cli/gateway: Standardized doc attributes and collection initialization.

Related Issues

Closes #1277

Testing

• Verified zero warnings with cargo clippy --workspace --all-features -- -D errors.
• Completed full cargo test run.

Checklist

• cargo fmt --check passes
• cargo clippy --workspace --all-features -- -D errors passes
• cargo test --workspace --all-features passes
• cargo build --examples succeeds
• cargo doc --workspace --no-deps --all-features succeeds
• Architecture layer rules respected (see CONTRIBUTING.md)
• Relevant documentation updated

[Bhanudahiyaa]

@lijingrs @BH3GEI
Hi maintainers,
It looks like the CI workflows are awaiting approval since this is coming from a fork.
Could someone approve the workflows so the checks can run?
Thanks!

[Nixxx19]

@Bhanudahiyaa nice one!!

[Bhanudahiyaa]

@Bhanudahiyaa nice one!!
Thanks mate!