build: optimize Postgres container configuration for performance and stability

Updated `dc-infra.yaml` to enable automatic restart (`unless-stopped`), introduce dynamic memory allocations via environment variables, and adjust healthcheck intervals for reduced load. Enhanced `postgresql.conf` with performance tuning comments, schema search path inclusion for Keycloak and app users, and SSL adjustments for internal communication.

dc-infra.yaml

@@ -9,7 +9,8 @@ services:
   postgres:
     image: "${POSTGRES_IMAGE:-postgres:16-alpine}"
     container_name: "${PROJECT_NAME:-meldestelle}-postgres"
-    restart: no
+    # OPTIMIERUNG: Automatischer Neustart bei System-Reboot
+    restart: unless-stopped
     ports:
       - "${POSTGRES_PORT:-5432:5432}"
     environment:
@@ -21,13 +22,22 @@ services:
       - "./config/docker/postgres:/docker-entrypoint-initdb.d:Z"
       - "./config/docker/postgres/postgresql.conf:/etc/postgresql/postgresql.conf:Z"
     profiles: [ "infra", "all" ]
-    command: [ "postgres", "-c", "config_file=/etc/postgresql/postgresql.conf" ]
+    # OPTIMIERUNG: Dynamische Speicherzuweisung via .env Overrides
+    command:
+      - "postgres"
+      - "-c"
+      - "config_file=/etc/postgresql/postgresql.conf"
+      - "-c"
+      - "shared_buffers=${POSTGRES_SHARED_BUFFERS:-256MB}"
+      - "-c"
+      - "effective_cache_size=${POSTGRES_EFFECTIVE_CACHE_SIZE:-768MB}"
     healthcheck:
       test: [ "CMD-SHELL", "pg_isready -U ${POSTGRES_USER} -d ${POSTGRES_DB}" ]
-      interval: "5s"
+      # OPTIMIERUNG: Höheres Intervall (10s), um Zora im Normalbetrieb zu entlasten
+      interval: "10s"
       timeout: "5s"
       retries: "5"
-      start_period: "10s"
+      start_period: "5s"
     networks:
       meldestelle-network:
         aliases: