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**

docker-compose.yml

@@ -4,9 +4,9 @@ services:
   postgres:
     image: postgres:16-alpine
     environment:
-      POSTGRES_USER: meldestelle
-      POSTGRES_PASSWORD: meldestelle
-      POSTGRES_DB: meldestelle
+      POSTGRES_USER: ${POSTGRES_USER:-meldestelle}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-meldestelle}
+      POSTGRES_DB: ${POSTGRES_DB:-meldestelle}
     ports:
       - "5432:5432"
     volumes:
@@ -40,12 +40,12 @@ services:
   keycloak:
     image: quay.io/keycloak/keycloak:23.0
     environment:
-      KEYCLOAK_ADMIN: admin
-      KEYCLOAK_ADMIN_PASSWORD: admin
-      KC_DB: postgres
-      KC_DB_URL: jdbc:postgresql://postgres:5432/keycloak
-      KC_DB_USERNAME: meldestelle
-      KC_DB_PASSWORD: meldestelle
+      KEYCLOAK_ADMIN: ${KEYCLOAK_ADMIN:-admin}
+      KEYCLOAK_ADMIN_PASSWORD: ${KEYCLOAK_ADMIN_PASSWORD:-admin}
+      KC_DB: ${KC_DB:-postgres}
+      KC_DB_URL: ${KC_DB_URL:-jdbc:postgresql://postgres:5432/keycloak}
+      KC_DB_USERNAME: ${KC_DB_USERNAME:-meldestelle}
+      KC_DB_PASSWORD: ${KC_DB_PASSWORD:-meldestelle}
     ports:
       - "8180:8080"
     depends_on:
@@ -66,7 +66,7 @@ services:
   zookeeper:
     image: confluentinc/cp-zookeeper:7.5.0
     environment:
-      ZOOKEEPER_CLIENT_PORT: 2181
+      ZOOKEEPER_CLIENT_PORT: ${ZOOKEEPER_CLIENT_PORT:-2181}
     ports:
       - "2181:2181"
     networks:
@@ -86,12 +86,12 @@ services:
     ports:
       - "9092:9092"
     environment:
-      KAFKA_BROKER_ID: 1
-      KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
-      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://kafka:29092,PLAINTEXT_HOST://localhost:9092
-      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: PLAINTEXT:PLAINTEXT,PLAINTEXT_HOST:PLAINTEXT
-      KAFKA_INTER_BROKER_LISTENER_NAME: PLAINTEXT
-      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
+      KAFKA_BROKER_ID: ${KAFKA_BROKER_ID:-1}
+      KAFKA_ZOOKEEPER_CONNECT: ${KAFKA_ZOOKEEPER_CONNECT:-zookeeper:2181}
+      KAFKA_ADVERTISED_LISTENERS: ${KAFKA_ADVERTISED_LISTENERS:-PLAINTEXT://kafka:29092,PLAINTEXT_HOST://localhost:9092}
+      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: ${KAFKA_LISTENER_SECURITY_PROTOCOL_MAP:-PLAINTEXT:PLAINTEXT,PLAINTEXT_HOST:PLAINTEXT}
+      KAFKA_INTER_BROKER_LISTENER_NAME: ${KAFKA_INTER_BROKER_LISTENER_NAME:-PLAINTEXT}
+      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: ${KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR:-1}
     networks:
       - meldestelle-network
     healthcheck:
@@ -130,6 +130,12 @@ services:
       - "9090:9090"
     networks:
       - meldestelle-network
+    healthcheck:
+      test: ["CMD", "wget", "-q", "-O", "-", "http://localhost:9090/-/healthy"]
+      interval: 10s
+      timeout: 5s
+      retries: 3
+      start_period: 15s
 
   grafana:
     image: grafana/grafana:latest
@@ -138,15 +144,22 @@ services:
       - ./config/monitoring/grafana/dashboards:/var/lib/grafana/dashboards
       - grafana-data:/var/lib/grafana
     environment:
-      - GF_SECURITY_ADMIN_USER=admin
-      - GF_SECURITY_ADMIN_PASSWORD=admin
-      - GF_USERS_ALLOW_SIGN_UP=false
+      - GF_SECURITY_ADMIN_USER=${GF_SECURITY_ADMIN_USER:-admin}
+      - GF_SECURITY_ADMIN_PASSWORD=${GF_SECURITY_ADMIN_PASSWORD:-admin}
+      - GF_USERS_ALLOW_SIGN_UP=${GF_USERS_ALLOW_SIGN_UP:-false}
     ports:
       - "3000:3000"
     networks:
       - meldestelle-network
     depends_on:
-      - prometheus
+      prometheus:
+        condition: service_healthy
+    healthcheck:
+      test: ["CMD", "wget", "-q", "-O", "-", "http://localhost:3000/api/health"]
+      interval: 10s
+      timeout: 5s
+      retries: 3
+      start_period: 20s
 
 volumes:
   postgres-data: