[OpenClaw CTO Bot] feat: Implement group cloning for recurring savings circles

[TimLiuDream]

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Fix for Issue #70

Problem

The protocol needed a clone_group function to allow admins to clone a completed group's settings and start a new cycle with the same members.

Solution

Implemented clone_group(admin, source_group_id) -> u64 that:

1. Validates the caller is the source group's admin
2. Validates the source group is in Completed or Active status
3. Copies token, contribution_amount, cycle_length, max_members from source
4. Auto-invites all previous members from the source group
5. Creates new group in Forming status
6. References source group in metadata via CloneSource DataKey

Changes

• group.rs: Added clone_group() function with full validation and member auto-invite
• lib.rs: Added clone_group entry point in contract implementation
• types.rs: Added CloneSource(u64) variant to DataKey enum
• storage.rs: Added set_clone_source() and get_clone_source() helpers
• errors.rs: Added InvalidGroupStatus error variant

Verification

• Only the source group's admin can clone
• Source group must be Completed or Active
• New group starts in Forming status with all original members
• Source group ID is stored as metadata reference
• All acceptance criteria from issue Implement group cloning for recurring savings circles #70 are met

Payment

Wallet: 0x83544d7a7c5dbe4d4ab06346bfae548175c49fb4