Initial Spring Boot backend with Modbus TCP infrastructure

.gitignore

@@ -0,0 +1,48 @@
+HELP.md
+target/
+.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+data/
+*.db
+*.db-journal
+*.log
+
+# Runtime telemetry dumps / future exports
+*.csv
+
+# Tauri frontend later if nested
+node_modules/
+
+# OS junk
+.DS_Store
+Thumbs.db