chore(devops): remove .idea files from git index and update .gitignore

.gitignore

@@ -1 +1,58 @@
-/.idea/
+# 🐧 [DevOps Engineer] Optimierte .gitignore für Meldestelle (KMP / Gradle / Docker)
+
+# --- IDE & Editor ---
+.idea/
+*.iml
+*.iws
+*.ipr
+out/
+.vscode/
+.history/
+.shelf/
+
+# --- Gradle ---
+.gradle/
+build/
+!**/src/**/build/
+gradle-app.setting
+!gradle-wrapper.jar
+.gradletasknamecache
+bin/
+
+# --- Kotlin / KMP ---
+.kotlin/
+kotlin-js-store/
+.jetbrains/
+
+# --- Android (falls relevant) ---
+*.ap_
+*.apk
+*.dex
+local.properties
+
+# --- Node / JS (Compose Web / KMP JS) ---
+node_modules/
+package-lock.json
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.npm/
+
+# --- Docker & Infrastructure ---
+.docker/
+*.log
+logs/
+.env
+!.env.example
+.data/
+postgres-data/
+
+# --- OS Specific ---
+.DS_Store
+Thumbs.db
+desktop.ini
+
+# --- Project Specific ---
+docs/temp/
+docs/Bin/
+docs/_archive/