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

quantdinger_vue/.dockerignore

@@ -1,41 +0,0 @@
-# Dependencies
-node_modules/
-
-# Build output (会在容器内构建)
-dist/
-
-# IDE
-.idea/
-.vscode/
-*.swp
-*.swo
-
-# Logs
-*.log
-npm-debug.log*
-yarn-debug.log*
-yarn-error.log*
-pnpm-debug.log*
-
-# Environment
-.env
-.env.local
-.env.*.local
-
-# Git
-.git/
-.gitignore
-
-# Tests
-tests/
-coverage/
-.nyc_output/
-
-# Documentation
-*.md
-!README.md
-
-# OS
-.DS_Store
-Thumbs.db
-