feat: Replace SearXNG with DuckDuckGo for product search

- Remove SearXNG container and configuration files
- Add duckduckgo-search library for web search
- Create duckduckgo_service.py with async search support
- Update search_service.py to use DuckDuckGo instead of SearXNG
- Fix BROWSERLESS_URL port to 3012

This eliminates the persistent limiter.toml directory issue and
provides a simpler, more reliable search solution.

docker-compose.yml

@@ -12,8 +12,7 @@ services:
       - "8555:8555"
     environment:
       - DATABASE_URL=postgresql://priceflow:priceflow@db:5432/priceflow
-      - BROWSERLESS_URL=ws://browserless:3000
-      - SEARXNG_URL=http://searxng:8080
+      - BROWSERLESS_URL=ws://browserless:3012
       - LOG_LEVEL=INFO
       - CORS_ORIGINS=*
     depends_on:
@@ -21,8 +20,6 @@ services:
         condition: service_healthy
       browserless:
         condition: service_started
-      searxng:
-        condition: service_started
     volumes:
       - screenshots_data:/app/screenshots
     networks:
@@ -50,26 +47,6 @@ services:
     networks:
       - nginx_default
 
-  # SearXNG - Moteur de recherche auto-hébergé
-  searxng:
-    image: searxng/searxng:latest
-    container_name: priceflow-searxng
-    restart: unless-stopped
-    ports:
-      - "8888:8080"
-    environment:
-      - SEARXNG_BASE_URL=http://searxng:8080
-      - SEARXNG_SECRET=priceflow-searxng-secret
-    volumes:
-      # Mount entire config directory to avoid file/directory issues
-      - ./searxng:/etc/searxng:rw
-    dns:
-      - 8.8.8.8
-      - 8.8.4.4
-      - 1.1.1.1
-    networks:
-      - nginx_default
-
   # Browserless - Navigateur headless pour le scraping
   browserless:
     image: ghcr.io/browserless/chromium:latest