refactor: Migrate from monolithic to modular architecture

1. **Docker-Compose für Entwicklung optimieren**
2. **Umgebungsvariablen für lokale Entwicklung**
3. **Service-Abhängigkeiten**
4. **Docker-Compose für Produktion**
5. **Dokumentation**

Dockerfile

@@ -1,5 +1,5 @@
 # ----------- Stage 1: Build Stage -----------
-FROM gradle:8.14-jdk21 AS build
+FROM gradle:8.14.3-jdk21 AS build
 WORKDIR /home/gradle/src
 
 # Copy only the files needed for dependency resolution first
@@ -7,28 +7,30 @@ WORKDIR /home/gradle/src
 COPY build.gradle.kts settings.gradle.kts gradle.properties ./
 COPY gradle ./gradle
 
-# Download dependencies and cache them
-RUN gradle dependencies --no-daemon
+# Download dependencies and cache them in separate layer
+RUN gradle dependencies --no-daemon --quiet
 
-# Copy source code
-COPY shared-kernel ./shared-kernel
-COPY api-gateway ./api-gateway
-COPY master-data ./master-data
-COPY member-management ./member-management
-COPY horse-registry ./horse-registry
-COPY event-management ./event-management
-COPY composeApp ./composeApp
-COPY server ./server
+# Copy source code in order of change frequency (least to most likely to change)
+COPY core ./core
+COPY platform ./platform
+COPY infrastructure ./infrastructure
+COPY masterdata ./masterdata
+COPY members ./members
+COPY horses ./horses
+COPY events ./events
 
 # Build with optimized settings
-RUN gradle :api-gateway:shadowJar --no-daemon --parallel --build-cache
+RUN gradle :infrastructure:gateway:shadowJar --no-daemon --parallel --build-cache --quiet
 
 # ----------- Stage 2: Runtime Stage -----------
-FROM openjdk:21-slim-bookworm AS runtime
+FROM eclipse-temurin:21-jre-alpine AS runtime
+
+# Install curl for health checks and ca-certificates for SSL
+RUN apk add --no-cache curl ca-certificates tzdata
 
 # Add non-root user for security
-RUN addgroup --system --gid 1001 appuser && \
-    adduser --system --uid 1001 --gid 1001 appuser
+RUN addgroup -g 1001 -S appuser && \
+    adduser -u 1001 -S appuser -G appuser
 
 # Set timezone
 ENV TZ=Europe/Vienna
@@ -37,7 +39,7 @@ RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
 WORKDIR /app
 
 # Copy the jar file from the build stage
-COPY --from=build /home/gradle/src/api-gateway/build/libs/*.jar ./app.jar
+COPY --from=build /home/gradle/src/infrastructure/gateway/build/libs/*.jar ./app.jar
 
 # Set ownership to non-root user
 RUN chown -R appuser:appuser /app
@@ -45,26 +47,36 @@ RUN chown -R appuser:appuser /app
 # Switch to non-root user
 USER appuser
 
-# Add metadata labels
+# Add metadata labels (OCI Image Format Specification)
 LABEL org.opencontainers.image.title="Meldestelle API Gateway"
-LABEL org.opencontainers.image.description="API Gateway for Meldestelle application"
+LABEL org.opencontainers.image.description="API Gateway for Meldestelle horse sport registration system"
 LABEL org.opencontainers.image.vendor="MoCode"
 LABEL org.opencontainers.image.version="1.0.0"
-LABEL org.opencontainers.image.created="2025-07-21"
+LABEL org.opencontainers.image.created="2025-07-24"
+LABEL org.opencontainers.image.source="https://github.com/mocode/meldestelle"
+LABEL org.opencontainers.image.documentation="https://github.com/mocode/meldestelle/blob/main/README.md"
+LABEL org.opencontainers.image.licenses="MIT"
 
 # Expose the application port
 EXPOSE 8081
 
 # Define health check
-HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \
+HEALTHCHECK --interval=30s --timeout=10s --start-period=60s --retries=3 \
   CMD curl -f http://localhost:8081/health || exit 1
 
-# Run the application with optimized JVM settings
+# Run the application with optimized JVM settings for containerized environment
 ENTRYPOINT ["java", \
+  "-XX:+UseContainerSupport", \
+  "-XX:MaxRAMPercentage=75.0", \
   "-XX:+UseG1GC", \
   "-XX:MaxGCPauseMillis=100", \
   "-XX:+ParallelRefProcEnabled", \
   "-XX:+HeapDumpOnOutOfMemoryError", \
   "-XX:HeapDumpPath=/tmp/heapdump.hprof", \
+  "-XX:+ExitOnOutOfMemoryError", \
+  "-XX:+UnlockExperimentalVMOptions", \
+  "-XX:+UseCGroupMemoryLimitForHeap", \
   "-Djava.security.egd=file:/dev/./urandom", \
+  "-Dfile.encoding=UTF-8", \
+  "-Duser.timezone=Europe/Vienna", \
   "-jar", "/app/app.jar"]