Restructure scripts into dev/ and prod/ for the devcontainer

- scripts/prod: entrypoint, db-setup and schema.sql shipped in the image
- scripts/dev: seed/clear db, psql and cleanup, run natively in the
  devcontainer instead of via docker-compose
- move setup.cfg to the repo root so linters pick it up
- Makefile targets run directly in the devcontainer

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

scripts/prod/db-setup.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+set -e
+
+echo "start db setup"
+
+if [ -z "$PGSQL_HOST" ]; then
+      echo "Note: Postgresql not set!!"
+      exit 1;
+fi
+
+export PGSQL_PORT="${PGSQL_PORT:-5432}"
+
+wait-for-it --timeout=15 "$PGSQL_HOST:$PGSQL_PORT"
+
+# Create schema in postgresql
+export PGPASSWORD="$PGSQL_PASSWORD"
+psql -1 -v ON_ERROR_STOP=1 -h "$PGSQL_HOST" -p "$PGSQL_PORT" -U "$PGSQL_USER" -d "$PGSQL_NAME" -f "$(dirname "${BASH_SOURCE[0]}")/schema.sql"
+
+echo "end db setup"