Initial commit: mail-server with WebFlux backend and Angular v22 Synthwave frontend

Co-authored-by: Junie <junie@jetbrains.com>

.gitignore

@@ -0,0 +1,48 @@
+# Java / Gradle
+*.class
+*.jar
+*.war
+*.ear
+*.log
+.gradle/
+build/
+**/build/
+
+# IDE
+.idea/
+*.iml
+*.ipr
+*.iws
+out/
+.vscode/
+
+# Node / Angular
+node_modules/
+dist/
+**/dist/
+.angular/
+package-lock.json
+
+# OS
+.DS_Store
+Thumbs.db
+desktop.ini
+
+# Temp
+*.tmp
+*.swp
+*.swo
+*~
+
+# Docker
+docker-compose.override.yml
+
+# Attachments (local dev)
+attachments/
+
+# DKIM keys (generate on each server)
+dkim-keys/
+
+# Environment variables
+.env
+.env.local