Flatten repo structure: move crawler/ to root, remove vqa/ and immoweb/

The crawler subdirectory was the only active project. Moving it to the
repo root simplifies paths and removes the unnecessary nesting. The
vqa/ and immoweb/ directories were legacy/unused and have been removed.

Updated .drone.yml, .gitignore, .claude/ docs, and skills to reflect
the new flat structure.

start.sh

@@ -0,0 +1,108 @@
+#!/usr/bin/env bash
+set -eu
+
+# Real Estate Crawler - Development Server
+# Starts all backend services + frontend + Caddy HTTPS proxy via Docker Compose.
+#
+# Usage:
+#   ./start.sh           - Start all services (backend + frontend)
+#   ./start.sh --build   - Rebuild images before starting
+#   ./start.sh --down    - Stop and remove all containers
+#   ./start.sh --logs    - Follow logs from all services
+#   ./start.sh --help    - Show help
+
+show_help() {
+    echo "Real Estate Crawler - Development Server"
+    echo ""
+    echo "Usage: ./start.sh [OPTIONS]"
+    echo ""
+    echo "Options:"
+    echo "  (default)     Start all services with Docker Compose"
+    echo "  --build       Rebuild Docker images before starting"
+    echo "  --down        Stop and remove all containers"
+    echo "  --logs        Follow logs from all services"
+    echo "  --help        Show this help message"
+    echo ""
+    echo "Services started:"
+    echo "  redis         Redis broker + cache          (port 6379)"
+    echo "  mysql         MySQL database                (port 3306)"
+    echo "  app           FastAPI backend (hot-reload)  (port 5001)"
+    echo "  celery        Celery background worker"
+    echo "  celery-beat   Celery periodic scheduler"
+    echo "  frontend      Vite dev server (hot-reload)  (port 5173)"
+    echo "  caddy         HTTPS reverse proxy           (port 443)"
+    echo ""
+    echo "Environment variables:"
+    echo "  DEV_HOST      Hostname for HTTPS access (default: localhost)"
+    echo "                Set this to your dev machine's hostname for OIDC auth."
+    echo ""
+    echo "Examples:"
+    echo "  ./start.sh                              # Start everything"
+    echo "  ./start.sh --build                      # Rebuild and start"
+    echo "  DEV_HOST=devvm.local ./start.sh         # Start with custom hostname"
+}
+
+get_compose_cmd() {
+    if command -v docker &> /dev/null; then
+        echo "docker compose"
+    elif command -v podman-compose &> /dev/null; then
+        echo "podman-compose"
+    else
+        echo "❌ Error: Neither docker nor podman-compose found." >&2
+        echo "   Install Docker: https://docs.docker.com/get-docker/" >&2
+        exit 1
+    fi
+}
+
+start_docker() {
+    local build_flag=""
+    if [[ "${1:-}" == "--build" ]]; then
+        build_flag="--build"
+    fi
+
+    echo "Starting all services with Docker Compose..."
+    echo ""
+
+    local compose_cmd
+    compose_cmd=$(get_compose_cmd)
+
+    $compose_cmd up $build_flag
+}
+
+stop_docker() {
+    echo "Stopping all containers..."
+    local compose_cmd
+    compose_cmd=$(get_compose_cmd)
+    $compose_cmd down
+}
+
+show_logs() {
+    local compose_cmd
+    compose_cmd=$(get_compose_cmd)
+    $compose_cmd logs -f
+}
+
+# Parse arguments
+case "${1:-}" in
+    --help|-h)
+        show_help
+        ;;
+    --down)
+        stop_docker
+        ;;
+    --logs)
+        show_logs
+        ;;
+    --build)
+        start_docker --build
+        ;;
+    "")
+        start_docker
+        ;;
+    *)
+        echo "❌ Unknown option: $1"
+        echo ""
+        show_help
+        exit 1
+        ;;
+esac