[Folex1275]

Contract Enhancements: Split Payouts, Funding, Deadline Extension, and Token Allowlist

This PR adds four new features to the deprader_router contract:

Split Bounty Payouts (#107)

• release_split(bounty_id, shares: Vec<(claim_id, bps)>) - Split payouts across multiple claimants
• Shares must sum to 10_000 basis points and reference distinct pending claims
• Rounding remainder goes to the first share
• Emits one released event per paid claim
• Adds Error::InvalidShares for validation

Fund Open Bounties (#108)

• fund_bounty(funder, bounty_id, amount) - Top up existing open bounties
• Tracks contributions per funder in Bounty.funders: Vec<(Address, i128)>
• cancel_bounty updated to refund each funder proportionally
• Emits funded event

Extend Deadline (#109)

• extend_deadline(creator, bounty_id, new_deadline) - Extend open bounty deadlines
• Only creator can extend, only to later times within MAX_BOUNTY_DURATION_SECS
• Emits extended event

Token Allowlist (#110)

• allow_token(token) / disallow_token(token) - Admin-managed allowlist
• is_token_allowed(token) - Check allowlist status
• create_bounty rejects disallowed tokens with Error::TokenNotAllowed
• Emits tkn_allow and tkn_dislow events

Tests

• 20 new tests covering all features and edge cases
• All validation, auth checks, and error paths tested

Closes #107
Closes #108
Closes #109
Closes #110

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