docs: document add-bond-invoice action for bond payout flow

[grunch]

Summary

• New page src/add_bond_invoice.md documenting Action::AddBondInvoice (introduced in mostro-core 0.11.2) — the bi-directional bond-payout invoice flow that fires after a solver-directed slash via bond_resolution on admin-settle / admin-cancel.
• Routing-layer note that add-bond-invoice (bond payout) and add-invoice (trade payout) must be dispatched on the action discriminator alone, not collapsed via status / memo heuristics.
• Cross-links from pay_bond_invoice.md, admin_settle_order.md, and admin_cancel_order.md into the new page; TOC entry in SUMMARY.md; user-facing message suggestion in message_suggestions_for_actions.md.

Test plan

• just build succeeds (mdBook compiles cleanly).
• book/add_bond_invoice.html renders with all internal links resolving.
• Reviewer eyeball-checks JSON payload shapes against mostro-core 0.11.2 (Payload::PaymentRequest for the reply, Payload::Order(SmallOrder) for the request).
• Confirm slash_node_share_pct = 1.0 vs < 1.0 behaviour and forfeit-deadline anchor (slashed_at + payout_claim_window_days * 86_400) match mostrod PR #738.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 799b6da1-bb3e-4ac7-92f6-b5f4a8866928

📥 Commits

Reviewing files that changed from the base of the PR and between 6ae34c4 and a2dcfe4.

📒 Files selected for processing (6)

• src/SUMMARY.md
• src/add_bond_invoice.md
• src/admin_cancel_order.md
• src/admin_settle_order.md
• src/message_suggestions_for_actions.md
• src/pay_bond_invoice.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/add-bond-invoice-action

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