Crypto trading bot: engine, brokers, backtester, dashboard, deploy

FastAPI backend with a single-strategy async engine, paper and Binance
brokers, pure-python indicators, a backtester that shares the engine's
portfolio math, and a Vue dashboard with a live WebSocket feed. Adds the
Gitea Actions CI/CD workflow that deploys to Traefik via docker_default.

frontend/src/format.test.js

@@ -0,0 +1,28 @@
+import { describe, expect, it } from 'vitest'
+import { fmtMoney, fmtPrice, pnlClass, signed } from './format'
+
+describe('format helpers', () => {
+  it('formats money with two decimals', () => {
+    expect(fmtMoney(10000)).toBe('10,000.00')
+  })
+
+  it('handles null', () => {
+    expect(fmtMoney(null)).toBe('—')
+    expect(fmtPrice(undefined)).toBe('—')
+  })
+
+  it('formats small prices with six decimals', () => {
+    expect(fmtPrice(0.5)).toBe('0.500000')
+  })
+
+  it('signs positive values', () => {
+    expect(signed(12.346)).toBe('+12.35')
+    expect(signed(-3)).toBe('-3.00')
+  })
+
+  it('classifies pnl colour', () => {
+    expect(pnlClass(5)).toBe('text-emerald-400')
+    expect(pnlClass(-5)).toBe('text-rose-400')
+    expect(pnlClass(0)).toBe('text-slate-300')
+  })
+})