Refactor: remove unused cogs and services, simplify architecture

- Remove admin.py and search.py cogs
- Remove searxng.py service and rate_limiter.py utility
- Update bot.py, ai_chat.py, config.py, and ai_service.py
- Update documentation and docker-compose.yml

docker-compose.yml

@@ -1,5 +1,3 @@
-version: "3.8"
-
 services:
   daemon-boyfriend:
     build: .
@@ -9,39 +7,3 @@ services:
       - .env
     environment:
       - PYTHONUNBUFFERED=1
-    depends_on:
-      searxng:
-        condition: service_healthy
-    networks:
-      - bot-network
-
-  # Optional: SearXNG instance
-  # Comment out if you're using an external SearXNG instance
-  searxng:
-    image: searxng/searxng:latest
-    container_name: searxng
-    restart: unless-stopped
-    ports:
-      - "8080:8080"
-    volumes:
-      - ./searxng:/etc/searxng:rw
-    environment:
-      - SEARXNG_BASE_URL=http://localhost:8080/
-    cap_drop:
-      - ALL
-    cap_add:
-      - CHOWN
-      - SETGID
-      - SETUID
-    healthcheck:
-      test: ["CMD", "wget", "--spider", "-q", "http://localhost:8080/healthz"]
-      interval: 30s
-      timeout: 10s
-      retries: 3
-      start_period: 10s
-    networks:
-      - bot-network
-
-networks:
-  bot-network:
-    driver: bridge