chore: consolidate platform split checks

scripts/launch-dev.sh

@@ -16,6 +16,7 @@ FRONTEND_FORCE_RELOAD="${GOVOPLAN_FRONTEND_FORCE_RELOAD:-1}"
 FRONTEND_CLEAR_VITE_CACHE="${GOVOPLAN_FRONTEND_CLEAR_VITE_CACHE:-1}"
 FRONTEND_USE_POLLING="${GOVOPLAN_FRONTEND_USE_POLLING:-1}"
 FRONTEND_POLLING_INTERVAL="${GOVOPLAN_FRONTEND_POLLING_INTERVAL:-500}"
+DEV_DATABASE_BACKEND="${GOVOPLAN_DEV_DATABASE_BACKEND:-postgres}"
 
 LOG_DIR="$ROOT/runtime/dev-launcher"
 BACKEND_LOG="$LOG_DIR/backend.log"
@@ -31,6 +32,20 @@ fail() {
   exit 1
 }
 
+case "$DEV_DATABASE_BACKEND" in
+  postgres)
+    export DATABASE_URL="${DATABASE_URL:-postgresql+psycopg://govoplan_dev@127.0.0.1:5432/govoplan_dev}"
+    export GOVOPLAN_DATABASE_URL_PGTOOLS="${GOVOPLAN_DATABASE_URL_PGTOOLS:-postgresql://govoplan_dev@127.0.0.1:5432/govoplan_dev}"
+    ;;
+  sqlite)
+    export DATABASE_URL="${DATABASE_URL:-sqlite:///$ROOT/runtime/multimailer-dev.db}"
+    ;;
+  *)
+    fail "Unsupported GOVOPLAN_DEV_DATABASE_BACKEND=$DEV_DATABASE_BACKEND. Use postgres or sqlite."
+    ;;
+esac
+export DEV_BOOTSTRAP_ENABLED="${DEV_BOOTSTRAP_ENABLED:-true}"
+
 port_is_free() {
   "$PYTHON" - "$1" "$2" <<'PY'
 import socket
@@ -139,6 +154,7 @@ GovOPlaN is running.
 Web UI:  $FRONTEND_URL
 API:     $BACKEND_URL/api/v1
 Health:  $BACKEND_URL/health
+DB:      $DATABASE_URL
 
 Logs:
 Backend: $BACKEND_LOG