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/Dockerfile.slim

@@ -0,0 +1,37 @@
+FROM node:24.5.0-slim AS builder
+
+RUN apt-get update && apt-get install -y python3 python3-pip sqlite3 && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /home/gooseek
+
+COPY package.json package-lock.json ./
+COPY apps/frontend/package.json ./apps/frontend/
+COPY apps/shared-types/package.json ./apps/shared-types/
+COPY apps/shared-utils/package.json ./apps/shared-utils/
+
+RUN npm install
+
+COPY apps ./apps
+
+RUN mkdir -p /home/gooseek/apps/frontend/data
+ENV DATA_DIR=/home/gooseek/apps/frontend
+RUN npm run build
+
+FROM node:24.5.0-slim
+
+RUN apt-get update && apt-get install -y python3 python3-pip sqlite3 && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /home/gooseek
+
+COPY --from=builder /home/gooseek/apps/frontend/public ./public
+COPY --from=builder /home/gooseek/apps/frontend/.next/static ./public/_next/static
+COPY --from=builder /home/gooseek/apps/frontend/.next/standalone ./
+COPY --from=builder /home/gooseek/apps/frontend/drizzle ./drizzle
+
+RUN mkdir -p /home/gooseek/data /home/gooseek/uploads
+
+EXPOSE 3000
+
+ENV DATA_DIR=/home/gooseek
+
+CMD ["node", "server.js"]