feat: add Docker setup and project structure

core/.dockerignore

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+# Gradle
+.gradle/
+build/
+!gradle/wrapper/gradle-wrapper.jar
+gradle-app.setting
+!gradle-app.setting
+
+# IDE
+.idea/
+.vscode/
+*.iml
+*.ipr
+*.iws
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Logs
+logs/
+*.log
+
+# Runtime
+target/
+*.jar
+!gradle/wrapper/gradle-wrapper.jar
+
+# Test results
+.allure/
+build/reports/
+build/test-results/
+
+# Environment
+.env
+.env.local
+.env.*.local
+
+# Git
+.git/
+.gitignore
+
+# Docker
+Dockerfile
+.dockerignore
+
+# Documentation
+README.md
+docs/
+
+# Temporary files
+*.tmp
+*.swp
+*.bak

core/Dockerfile

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+# Multi-stage build for Spring Boot application
+FROM openjdk:21-jdk-slim as builder
+
+# Install curl, wget and unzip
+RUN apt-get update && apt-get install -y curl wget unzip && \
+    wget -O /tmp/gradle.zip https://services.gradle.org/distributions/gradle-8.5-bin.zip && \
+    unzip /tmp/gradle.zip -d /opt && \
+    ln -s /opt/gradle-8.5/bin/gradle /usr/local/bin/gradle && \
+    rm /tmp/gradle.zip && \
+    rm -rf /var/lib/apt/lists/*
+
+# Set working directory
+WORKDIR /app
+
+# Copy build files
+COPY build.gradle .
+COPY settings.gradle .
+
+# Copy source code
+COPY src/ src/
+
+# Build the application
+RUN gradle clean build -x test
+
+# Runtime stage
+FROM openjdk:21-slim
+
+# Install curl for health checks
+RUN apt-get update && apt-get install -y curl && rm -rf /var/lib/apt/lists/*
+
+# Create app user
+RUN groupadd -r appuser && useradd -r -g appuser appuser
+
+# Set working directory
+WORKDIR /app
+
+# Copy the built jar from builder stage
+COPY --from=builder /app/build/libs/*.jar app.jar
+
+# Create logs directory
+RUN mkdir -p /app/logs && chown -R appuser:appuser /app
+
+# Switch to app user
+USER appuser
+
+# Expose port
+EXPOSE 8080
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=60s --retries=3 \
+  CMD curl -f http://localhost:8080/actuator/health || exit 1
+
+# JVM arguments for production
+ENV JAVA_OPTS="-Xms512m -Xmx1g -XX:+UseG1GC -XX:+UseContainerSupport"
+
+# Run the application
+ENTRYPOINT ["sh", "-c", "java $JAVA_OPTS -jar app.jar"]

core/build.gradle

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+plugins {
+    id 'java'
+    id 'org.springframework.boot' version '3.2.0'
+    id 'io.spring.dependency-management' version '1.1.4'
+}
+
+group = 'com.opencontext'
+version = '1.0.0'
+
+java {
+    sourceCompatibility = '21'
+}
+
+configurations {
+    compileOnly {
+        extendsFrom annotationProcessor
+    }
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    // Spring Boot Starters
+    implementation 'org.springframework.boot:spring-boot-starter-web'
+    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+    implementation 'org.springframework.boot:spring-boot-starter-security'
+    implementation 'org.springframework.boot:spring-boot-starter-validation'
+    implementation 'org.springframework.boot:spring-boot-starter-actuator'
+    implementation 'org.springframework.boot:spring-boot-starter-data-elasticsearch'
+
+    // Database
+    runtimeOnly 'org.postgresql:postgresql'
+
+    // API Documentation
+    implementation 'org.springdoc:springdoc-openapi-starter-webmvc-ui:2.2.0'
+
+    // Object Storage (MinIO)
+    implementation 'io.minio:minio:8.5.7'
+
+    // HTTP Client
+    implementation 'org.springframework.boot:spring-boot-starter-webflux'
+
+    // Utilities
+    compileOnly 'org.projectlombok:lombok'
+    annotationProcessor 'org.projectlombok:lombok'
+    implementation 'org.mapstruct:mapstruct:1.5.5.Final'
+    annotationProcessor 'org.mapstruct:mapstruct-processor:1.5.5.Final'
+
+    // JSON Processing
+    implementation 'com.fasterxml.jackson.core:jackson-databind'
+    implementation 'com.fasterxml.jackson.datatype:jackson-datatype-jsr310'
+
+    // Test Dependencies
+    testImplementation 'org.springframework.boot:spring-boot-starter-test'
+    testImplementation 'org.springframework.security:spring-security-test'
+    testImplementation 'org.testcontainers:junit-jupiter'
+    testImplementation 'org.testcontainers:postgresql'
+    testImplementation 'org.testcontainers:elasticsearch'
+}
+
+dependencyManagement {
+    imports {
+        mavenBom "org.testcontainers:testcontainers-bom:1.19.3"
+    }
+}
+
+tasks.named('test') {
+    useJUnitPlatform()
+}

core/gradle/wrapper/gradle-wrapper.properties

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

core/settings.gradle

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+rootProject.name = 'core'

core/src/main/java/com/opencontext/OpenContextApplication.java

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+package com.opencontext;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
+import org.springframework.scheduling.annotation.EnableAsync;
+
+@SpringBootApplication
+@EnableJpaAuditing
+@EnableAsync
+public class OpenContextApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(OpenContextApplication.class, args);
+    }
+}