feat(registry): configurable protocol-fee recipient (#99)

[ZacLou]

Closes #99

Adds a configurable protocol-fee recipient address to the Registry contract:

• set_fee_recipient(address) is admin-gated (same threshold pattern as set_fee) and emits a ee_rcpt governance event.
• get_fee_recipient() returns the configured address, defaulting to the admin for existing deployments.
• Repayment now routes fee transfers to
  egistry.get_fee_recipient() instead of always using the primary admin signer.

Fee rate and collection math are unchanged per the issue scope.

cargo test -p invofi-registry and cargo build --workspace pass.

[coderabbitai]

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[samjay8]

🤖 Auto-merge bot — ⚠️ You are not assigned to issue #99.

Please request assignment before opening a PR. Maintainers assign issues to avoid duplicate work and ensure quality review.

Once assigned, this PR will be re-evaluated automatically.

[samjay8]

🤖 Auto-merge bot — ❌ CI failed. What broke:

• Soroban Scout (failure)
  (no details — see the check log)

Please fix and push — I will re-check automatically.

[samjay8]

🤖 Auto-merge bot — ✅ All required CI checks and the CodeRabbit review passed.

This PR accomplishes:

• set_fee_recipient(address) is admin-gated (same threshold pattern as set_fee) and emits a ee_rcpt governance event.
• get_fee_recipient() returns the configured address, defaulting to the admin for existing deployments.
• Repayment now routes fee transfers to
  egistry.get_fee_recipient() instead of always using the primary admin signer.
  Diff: the diff — verified within scope.
  CI is green — merging now.

[samjay8]

🤖 Approved — all required CI checks and the CodeRabbit review passed.

[samjay8]

🎉 Merged — thanks for the contribution!