feat: SSE live fight spectating with spectator count

Enable real-time fight spectating for all live fights (not just human
fights). Multiple spectators can watch simultaneously via SSE. Spectator
count is tracked per-fight and broadcast with every SSE event.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.claude/plans/precious-sniffing-catmull.md

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+# Plan: Create Zaps.md Implementation Guide
+
+## Context
+The user wants a `Zaps.md` planning document at the project root that serves as a comprehensive implementation guide for a future Claude session. When the user says "implement zaps", Claude reads this doc and knows exactly what to build.
+
+## What to create
+- **File**: `/Users/dorian/Projects/botfights/Zaps.md`
+
+## Key design decisions from research
+
+### Payment model: NWC (primary) + Cashu (alternative)
+- NWC (NIP-47): User connects Lightning wallet once. Server sends encrypted payment requests via Nostr relay. Use nostr-tools directly (no Alby SDK) for privacy.
+- Cashu ecash: Alternative — user pastes ecash token, server redeems with mint.
+- Server wallet: Small Lightning wallet (Alby Hub or LNbits) via `BOTFIGHTS_NWC_URL` env var. Transient escrow only (seconds, not balances).
+
+### Two modes: Free (unchanged) + Ranked (new, 21 sats)
+- Ranked: both pay 21 sats → winner gets 42 sats
+- Ranked queue never matches against mock bots
+- Timeout = refund (not mock fallback)
+
+### New files needed
+- DB tables: `payments`, `wallet_connections` + new columns on fights/bots
+- Server: `engine/payments.ts`, `engine/ranked-queue.ts`, `routes/payments.ts`
+- Frontend: `composables/useWallet.ts`, `components/WalletConnect.vue`
+- Modifications to: orchestrator, queue routes, JoinBoutPage, FightPage, BotProfilePage, schema
+
+### Dependencies (all MIT)
+- `nostr-tools` ^2.x — NWC protocol
+- `@cashu/cashu-ts` ^2.x — ecash tokens
+
+## Implementation
+Write Zaps.md with full architecture, schema SQL, function signatures, edge cases, phases, and security notes — enough for a fresh Claude session to implement from.
+
+## Verification
+- Read the written Zaps.md and confirm completeness
+- Ensure all file paths match actual codebase structure