feat: монорепо миграция, Discover/SearxNG улучшения

- Миграция на монорепозиторий (apps/frontend, apps/chat-service, etc.)
- Discover: проверка SearxNG, понятное empty state при ненастроенном поиске
- searxng.ts: валидация URL, проверка JSON-ответа, авто-добавление http://
- docker/searxng-config: настройки для JSON API SearxNG

Co-authored-by: Cursor <cursoragent@cursor.com>

docker/entrypoint.sh

@@ -0,0 +1,32 @@
+#!/bin/sh
+set -e
+
+echo "Starting SearXNG..."
+
+sudo -H -u searxng bash -c "cd /usr/local/searxng/searxng-src && export SEARXNG_SETTINGS_PATH='/etc/searxng/settings.yml' && export FLASK_APP=searx/webapp.py && /usr/local/searxng/searx-pyenv/bin/python -m flask run --host=0.0.0.0 --port=8080" &
+SEARXNG_PID=$!
+
+echo "Waiting for SearXNG to be ready..."
+sleep 5
+
+COUNTER=0
+MAX_TRIES=30
+until curl -s http://localhost:8080 > /dev/null 2>&1; do
+  COUNTER=$((COUNTER+1))
+  if [ $COUNTER -ge $MAX_TRIES ]; then
+    echo "Warning: SearXNG health check timeout, but continuing..."
+    break
+  fi
+  sleep 1
+done
+
+if curl -s http://localhost:8080 > /dev/null 2>&1; then
+  echo "SearXNG started successfully (PID: $SEARXNG_PID)"
+else
+  echo "SearXNG may not be fully ready, but continuing (PID: $SEARXNG_PID)"
+fi
+
+cd /home/gooseek
+echo "Starting GooSeek..."
+
+exec node server.js