Subscription Plan creation should not require wallet connection and should include payee address field

[coderabbitai]

Problem

Creating a Subscription Plan currently requires connecting a wallet even though it doesn't require a signature. This creates unnecessary friction in the user experience.

Expected Behavior

• Creating a Subscription Plan should not require wallet connection
• The Create Subscription Plan component should include a "Payee" address field
• Proper address validation should be implemented for the payee field

Current Behavior

• Users must connect their wallet before creating a subscription plan
• No payee address field is available in the creation form

Context

This issue was identified during review of PR #98: #98
Original comment: #98 (comment)

Removing the wallet connection should also fix #101.

Screenshots