feat: integrate SearXNG web search service with platform capabilities

- Added SearXNG service configuration to Docker setup, including environment variables and health checks.
- Introduced new settings management for web search in the frontend, allowing users to enable/disable and configure search engines and language preferences.
- Updated backend to support web search functionality, including database schema changes and service integration.
- Implemented health check endpoint for the web search service and integrated it into the application.
- Removed legacy SearXNG API connector references in favor of the new platform service approach.

docker/docker-compose.dev.yml

@@ -57,6 +57,23 @@ services:
       timeout: 5s
       retries: 5
 
+  searxng:
+    image: searxng/searxng:2024.12.23
+    ports:
+      - "${SEARXNG_PORT:-8888}:8080"
+    volumes:
+      - ./searxng/settings.yml:/etc/searxng/settings.yml:ro
+      - ./searxng/limiter.toml:/etc/searxng/limiter.toml:ro
+      - searxng_data:/etc/searxng
+    environment:
+      - SEARXNG_BASE_URL=http://localhost:${SEARXNG_PORT:-8888}/
+      - SEARXNG_SECRET=${SEARXNG_SECRET:-surfsense-searxng-secret}
+    healthcheck:
+      test: ["CMD", "wget", "--spider", "-q", "http://localhost:8080/healthz"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
   backend:
     build: ../surfsense_backend
     ports:
@@ -81,6 +98,7 @@ services:
       - ELECTRIC_DB_PASSWORD=${ELECTRIC_DB_PASSWORD:-electric_password}
       - AUTH_TYPE=${AUTH_TYPE:-LOCAL}
       - NEXT_FRONTEND_URL=${NEXT_FRONTEND_URL:-http://localhost:3000}
+      - SEARXNG_DEFAULT_HOST=${SEARXNG_DEFAULT_HOST:-http://searxng:8080}
       # Daytona Sandbox – uncomment and set credentials to enable cloud code execution
       # - DAYTONA_SANDBOX_ENABLED=TRUE
       # - DAYTONA_API_KEY=${DAYTONA_API_KEY:-}
@@ -92,6 +110,8 @@ services:
         condition: service_healthy
       redis:
         condition: service_healthy
+      searxng:
+        condition: service_healthy
     healthcheck:
       test: ["CMD", "curl", "-f", "http://localhost:8000/health"]
       interval: 15s
@@ -115,6 +135,7 @@ services:
       - PYTHONPATH=/app
       - ELECTRIC_DB_USER=${ELECTRIC_DB_USER:-electric}
       - ELECTRIC_DB_PASSWORD=${ELECTRIC_DB_PASSWORD:-electric_password}
+      - SEARXNG_DEFAULT_HOST=${SEARXNG_DEFAULT_HOST:-http://searxng:8080}
       - SERVICE_ROLE=worker
     depends_on:
       db:
@@ -205,3 +226,5 @@ volumes:
     name: surfsense-dev-redis
   shared_temp:
     name: surfsense-dev-shared-temp
+  searxng_data:
+    name: surfsense-dev-searxng