Local dev stack improvements

- Extend docker-compose.dev.yml with optional monitoring profile
  (Prometheus, Grafana, Loki) via --profile monitoring
- Align dev PostgreSQL with production: pg_stat_statements + init scripts
- Add scripts/seed.ts with idempotent Berlin test data (user, route, activity)
- Add pnpm db:seed and pnpm dev:reset scripts
- Simplify CI e2e job: replace manual docker run + BRouter setup with
  docker compose up --wait; add db:seed step
- Improve scripts/dev.sh: Docker check, --wait health checks, --monitoring
  flag, seed step
- Add scripts/reset-dev.sh to wipe and restart the local stack
- Add .env.development.example with documented local defaults

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/reset-dev.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+set -euo pipefail
+
+PROJECT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+cd "$PROJECT_DIR"
+
+if ! docker info > /dev/null 2>&1; then
+  echo "Error: Docker is not running. Please start Docker and try again."
+  exit 1
+fi
+
+echo "=== Resetting dev environment ==="
+echo "This will stop all containers and wipe all local data volumes."
+echo ""
+
+read -r -p "Are you sure? [y/N] " confirm
+if [[ "$confirm" != "y" && "$confirm" != "Y" ]]; then
+  echo "Aborted."
+  exit 0
+fi
+
+echo "Stopping containers and removing volumes..."
+docker compose -f docker-compose.dev.yml --profile monitoring down -v 2>/dev/null || \
+  docker compose -f docker-compose.dev.yml down -v
+
+echo "✓ Done. Run 'pnpm dev:full' to start fresh."