fix(devcontainer): configure jvm memory limits to prevent oom kills

- reduce MAVEN_OPTS from 2GB to 1GB to allow room for Spring Boot
- add SPRING_JVM_ARGS (1GB) for explicit Spring Boot JVM control
- lower JAVA_TOOL_OPTIONS MaxRAMPercentage from 50% to 25%
- update run.sh to pass memory settings to spring-boot:run

This prevents OOM kills when Maven compiler and Spring Boot JVM
run simultaneously during development.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: Developer

.devcontainer/devcontainer.json

@@ -81,8 +81,12 @@
     // Playwright browsers are pre-installed in the Docker image
     "PLAYWRIGHT_BROWSERS_PATH": "/home/vscode/.cache/ms-playwright",
     // JVM Performance Optimizations
-    "MAVEN_OPTS": "-Xmx2g -XX:+UseG1GC -XX:+UseStringDeduplication",
-    "JAVA_TOOL_OPTIONS": "-XX:+UseContainerSupport -XX:MaxRAMPercentage=50.0",
+    // MAVEN_OPTS: Maven compiler JVM (1GB to allow room for Spring Boot)
+    // SPRING_JVM_ARGS: Spring Boot application JVM (1GB default, override as needed)
+    // JAVA_TOOL_OPTIONS: Fallback for all Java processes (conservative 25%)
+    "MAVEN_OPTS": "-Xmx1g -XX:+UseG1GC -XX:+UseStringDeduplication",
+    "SPRING_JVM_ARGS": "-Xmx1g -XX:+UseG1GC",
+    "JAVA_TOOL_OPTIONS": "-XX:+UseContainerSupport -XX:MaxRAMPercentage=25.0",
     // Node.js Memory Optimization (2GB for 4GB RAM container)
     "NODE_OPTIONS": "--max-old-space-size=2048",
     // Bash history persistence

apps/backend/run.sh

@@ -49,9 +49,15 @@ fi
 
 ensure_java
 
+# Memory settings for development
+# MAVEN_OPTS controls the Maven JVM (compilation)
+# spring-boot.run.jvmArguments controls the Spring Boot application JVM
+export MAVEN_OPTS="${MAVEN_OPTS:--Xmx1g -XX:+UseG1GC}"
+SPRING_JVM_ARGS="${SPRING_JVM_ARGS:--Xmx1g -XX:+UseG1GC}"
+
 # Run Spring Boot application (use mvn if mvnw not available)
 if [ -f ./mvnw ]; then
-    ./mvnw spring-boot:run
+    ./mvnw spring-boot:run -Dspring-boot.run.jvmArguments="$SPRING_JVM_ARGS"
 else
-    mvn spring-boot:run
+    mvn spring-boot:run -Dspring-boot.run.jvmArguments="$SPRING_JVM_ARGS"
 fi