Adding validator Everstake

[ab-everstake]

Add Validator Profile

Validator Information

• Everstake:
• 0x152a28aed92e8f98fd154399d814a052ca816ea1:

Checklist

Please ensure you have completed the following before submitting:

• Added validator profile JSON file: mainnet/0x152a28aed92e8f98fd154399d814a052ca816ea1.json
• Added validator profile image: mainnet/images/0x152a28aed92e8f98fd154399d814a052ca816ea1.png
• Verified JSON format is valid
• Confirmed all URLs are working
• Used actual validator address as filename
• Profile image is under 1MB
• Provided accurate contact information

Additional Information

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By submitting this PR, I confirm that:

• The information provided is accurate
• I am the operator of this validator
• The profile image and content are appropriate and professional