chore: Projektbasis und PostgreSQL-Migrationen einrichten

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

compose.yaml

@@ -0,0 +1,20 @@
+name: kibu
+services:
+  db:
+    image: postgres:17-alpine
+    environment:
+      POSTGRES_DB: kibu
+      POSTGRES_USER: kibu
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:?Run npm run configure first}
+    ports:
+      - "127.0.0.1:55432:5432"
+    volumes:
+      - kibu_postgres:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U kibu -d kibu"]
+      interval: 3s
+      timeout: 3s
+      retries: 20
+    restart: unless-stopped
+volumes:
+  kibu_postgres: