[Performance] Replace Collections.EMPTY_* with empty*() to avoid unchecked warnings

[Senrian]

Description

Replace deprecated Collections.EMPTY_* static fields with modern empty*() factory methods to avoid raw type warnings and improve code quality.

Changes

• Replace Collections.EMPTY_MAP with Collections.emptyMap()
• Replace Collections.EMPTY_LIST with Collections.emptyList()
• Replace Collections.EMPTY_SET with Collections.emptySet()

Benefits

• Eliminates unchecked type warnings
• Follows modern Java best practices
• More readable and maintainable code

Testing

• Local build passed