refactor(docker): improve Docker setup and reduce image size

- Add multi-stage build to Dockerfile for smaller production image
- Move docker-compose.yml to project root for easier usage
- Flatten docker/init/setup.sh to docker/setup.sh
- Expand .dockerignore to exclude unnecessary files
- Remove deprecated version field from compose files

docker/setup.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+set -e
+echo "INIT!"
+pg_restore --username="$POSTGRES_USER" --dbname="$POSTGRES_DB" --verbose /schemas/init.sql
+
+echo "Updating!"
+if ls /schemas/update-schema/*.sql 1> /dev/null 2>&1; then
+  for file in /schemas/update-schema/*.sql
+  do
+    psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" -1 -f "$file"
+  done
+else
+  echo "No update schemas found"
+fi
+
+echo "Patching!"
+if ls /schemas/patch-schema/*.sql 1> /dev/null 2>&1; then
+  for file in /schemas/patch-schema/*.sql
+  do
+    psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" -1 -f "$file"
+  done
+else
+  echo "No patch schemas found"
+fi
+
+echo "Database initialization complete!"