build(docker): add container setup with persistent ./data volume

Add a multi-stage Dockerfile (Vue build + .NET 10 publish) and a docker-compose service exposing port 8080 with a single bind mount ./data -> /app/data for SurrealDB persistence. Include an example compose file, a .dockerignore, and document Docker usage and version 0.0.1 in the README.

docker-compose.yaml

@@ -0,0 +1,31 @@
+name: tarninahub
+
+services:
+  app:
+    image: tarninahub:0.0.1
+    build:
+      context: .
+      dockerfile: Dockerfile
+      args:
+        APP_VERSION: 0.0.1
+    container_name: tarninahub
+    restart: unless-stopped
+    # RocksDB zapisuje do bind-mountu ./data; root upraszcza uprawnienia (MVP).
+    user: "0:0"
+    ports:
+      - "${TARNINAHUB_PORT:-8080}:8080"
+    environment:
+      ASPNETCORE_ENVIRONMENT: Production
+      ASPNETCORE_URLS: http://+:8080
+      SurrealDb__Namespace: hubmi
+      SurrealDb__Database: hubmi
+      SurrealDb__DataDirectory: data
+    volumes:
+      # Jedyny volumen aplikacji — trwałe dane (SurrealDB / RocksDB).
+      - ./data:/app/data
+    healthcheck:
+      test: ["CMD", "curl", "-fsS", "http://localhost:8080/api/health"]
+      interval: 30s
+      timeout: 5s
+      retries: 3
+      start_period: 20s