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/.editorconfig

@@ -1,39 +0,0 @@
-[*]
-charset=utf-8
-end_of_line=lf
-insert_final_newline=false
-indent_style=space
-indent_size=2
-
-[{*.ng,*.sht,*.html,*.shtm,*.shtml,*.htm}]
-indent_style=space
-indent_size=2
-
-[{*.jhm,*.xslt,*.xul,*.rng,*.xsl,*.xsd,*.ant,*.tld,*.fxml,*.jrxml,*.xml,*.jnlp,*.wsdl}]
-indent_style=space
-indent_size=2
-
-[{.babelrc,.stylelintrc,jest.config,.eslintrc,.prettierrc,*.json,*.jsb3,*.jsb2,*.bowerrc}]
-indent_style=space
-indent_size=2
-
-[*.svg]
-indent_style=space
-indent_size=2
-
-[*.js.map]
-indent_style=space
-indent_size=2
-
-[*.less]
-indent_style=space
-indent_size=2
-
-[*.vue]
-indent_style=space
-indent_size=2
-
-[{.analysis_options,*.yml,*.yaml}]
-indent_style=space
-indent_size=2
-