Add workspace management and isolated worktree environments

scripts/init-worktree-env.sh

@@ -0,0 +1,56 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ENV_FILE="${1:-.env.worktree}"
+
+if [ -f "$ENV_FILE" ] && [ "${FORCE:-0}" != "1" ]; then
+  echo "Refusing to overwrite existing $ENV_FILE. Re-run with FORCE=1 if you want to regenerate it."
+  exit 1
+fi
+
+worktree_name="${WORKTREE_NAME:-$(basename "$PWD")}"
+slug="$(printf '%s' "$worktree_name" | tr '[:upper:]' '[:lower:]' | sed 's/[^a-z0-9]/_/g; s/__*/_/g; s/^_//; s/_$//')"
+if [ -z "$slug" ]; then
+  slug="multica"
+fi
+
+hash_value="$(printf '%s' "$PWD" | cksum | awk '{print $1}')"
+offset=$((hash_value % 1000))
+
+postgres_db="multica_${slug}"
+postgres_port=$((15432 + offset))
+backend_port=$((18080 + offset))
+frontend_port=$((13000 + offset))
+frontend_origin="http://localhost:${frontend_port}"
+compose_project_name="multica_${slug}_${offset}"
+
+cat > "$ENV_FILE" <<EOF
+COMPOSE_PROJECT_NAME=${compose_project_name}
+POSTGRES_DB=${postgres_db}
+POSTGRES_USER=multica
+POSTGRES_PASSWORD=multica
+POSTGRES_PORT=${postgres_port}
+DATABASE_URL=postgres://multica:multica@localhost:${postgres_port}/${postgres_db}?sslmode=disable
+
+PORT=${backend_port}
+JWT_SECRET=change-me-in-production
+MULTICA_SERVER_URL=ws://localhost:${backend_port}/ws
+
+GOOGLE_CLIENT_ID=
+GOOGLE_CLIENT_SECRET=
+GOOGLE_REDIRECT_URI=${frontend_origin}/auth/callback
+
+FRONTEND_PORT=${frontend_port}
+FRONTEND_ORIGIN=${frontend_origin}
+NEXT_PUBLIC_API_URL=http://localhost:${backend_port}
+NEXT_PUBLIC_WS_URL=ws://localhost:${backend_port}/ws
+EOF
+
+echo "Generated $ENV_FILE for worktree '$worktree_name'"
+echo "  Postgres: ${postgres_db} on localhost:${postgres_port}"
+echo "  Backend:  http://localhost:${backend_port}"
+echo "  Frontend: ${frontend_origin}"
+echo ""
+echo "Next steps:"
+echo "  make setup"
+echo "  make start"