Initial Ktor backend skeleton with ProtocolMessage DTO, REST and WebSocket

.gitignore

@@ -1,23 +1,25 @@
-# Kotlin/Java
-*.class
-*.jar
-*.iml
-/out/
+# Gradle/Java/Kotlin
+.gradle/
 build/
+out/
+*.iml
 
-# ESP32 / PlatformIO / Arduino
-*.bin
-*.elf
-*.pio
-*.pioenvs/
-*.idf/
-
-# Android
-/.gradle/
-/build/
-/local.properties
+# IDEA
 .idea/
+*.iws
+*.ipr
+
+# Logs
+*.log
 
 # OS
 .DS_Store
-Thumbs.db
+Thumbs.db
+
+# Node/npm (если есть frontend/mobile)
+node_modules/
+dist/
+
+# Python (если будет)
+__pycache__/
+*.pyc