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.

.gitignore

@@ -13,6 +13,9 @@ Thumbs.db
 bin/
 obj/
 
+# Local SurrealDB data (embedded RocksDB) — persisted next to the running app
+data/
+
 # Node
 node_modules/
 dist/
@@ -28,3 +31,7 @@ backend/local-docs/
 .env
 .env.*
 !.env.example
+
+# Docker — lokalne nadpisania
+docker-compose.override.yaml
+docker-compose.override.yml