Initial commit: Arb Pulse monolith with CI and optional Fly deploy.

Real-time BTC cross-exchange arbitrage detection (Kraken, Bybit, OKX, Binance)
with React dashboard, GitHub Actions CI, and documented Fly.io deploy workflow.

Co-authored-by: Cursor <cursoragent@cursor.com>

.dockerignore

@@ -0,0 +1,18 @@
+node_modules
+web/node_modules
+.env
+.env.*
+!.env.example
+.git
+.gitignore
+data
+web/dist
+dist
+.cursor
+*.ndjson
+feed.ndjson
+README.md
+AGENTS.md
+.github
+coverage
+*.log