v2.2.1: frontend closed-source + Docker one-click deploy

- Remove frontend source code (now in private repo)
- Add pre-built frontend/dist/ with Nginx serving
- Simplify docker-compose.yml (no Node.js build needed)
- Update README with docs index and Docker deploy guide
- Add admin order list and AI analysis stats tabs
- Add quick trade API routes
- Clean up redundant files (package-lock.json, yarn.lock, .iml)
- Add GitHub Actions workflow for frontend update automation

scripts/build-frontend.sh

@@ -0,0 +1,58 @@
+#!/bin/bash
+# ======================================================
+# QuantDinger Frontend Build Script
+# Run this in your PRIVATE frontend repo to build and
+# sync compiled files to the open-source repo.
+#
+# Usage:
+#   ./scripts/build-frontend.sh
+#
+# Prerequisites:
+#   - Node.js >= 16
+#   - quantdinger_vue/ source code available
+# ======================================================
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
+VUE_DIR="$PROJECT_ROOT/quantdinger_vue"
+DIST_TARGET="$PROJECT_ROOT/frontend/dist"
+
+echo "============================================"
+echo "  QuantDinger Frontend Build"
+echo "============================================"
+
+# Check if source exists
+if [ ! -d "$VUE_DIR" ]; then
+    echo "ERROR: quantdinger_vue/ directory not found!"
+    echo "This script should be run in the dev environment with frontend source."
+    exit 1
+fi
+
+# Build frontend
+echo "[1/3] Installing dependencies..."
+cd "$VUE_DIR"
+npm install --legacy-peer-deps
+
+echo "[2/3] Building production bundle..."
+npm run build
+
+# Sync dist
+echo "[3/3] Syncing dist to frontend/dist/..."
+rm -rf "$DIST_TARGET"/*
+cp -r "$VUE_DIR/dist/"* "$DIST_TARGET/"
+
+echo ""
+echo "============================================"
+echo "  Build complete!"
+echo "  Output: frontend/dist/"
+echo "  Files: $(find "$DIST_TARGET" -type f | wc -l)"
+echo "  Size:  $(du -sh "$DIST_TARGET" | cut -f1)"
+echo "============================================"
+echo ""
+echo "Next steps:"
+echo "  cd $PROJECT_ROOT"
+echo "  git add frontend/dist/"
+echo "  git commit -m 'chore: update frontend build'"
+echo "  git push"