refactor: 移除java项目，改用hono + vercel function实现后端 (#1)

Co-authored-by: gin <gin-18@qq.com>
Co-authored-by: gin <dengxinmin@owlscm.com>
Reviewed-on: #1

.gitignore

@@ -1,5 +1,7 @@
 # Common
 .DS_Store
+/.env
+/node_modules/
 .idea/
 *.iws
 *.iml
@@ -36,6 +38,7 @@
 /frontend/web/.vscode/launch.json
 
 # Backend build tools
+/backend/node_modules/
 /backend/.gradle/
 /backend/build/
 !/backend/gradle/wrapper/gradle-wrapper.jar
@@ -68,4 +71,4 @@
 !/backend/*/build/*.xml
 
 # Backend local configuration
-/backend/agileboot-admin/src/main/resources/application-prod.yml
+/backend/.env