feat(infra): add SearXNG dev container

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.env.example

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+DATABASE_PATH=./data/kochwas.db
+IMAGE_DIR=./data/images
+SEARXNG_URL=http://localhost:8888

docker-compose.yml

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+services:
+  searxng:
+    image: searxng/searxng:latest
+    ports:
+      - '8888:8080'
+    volumes:
+      - ./searxng:/etc/searxng
+    environment:
+      - BASE_URL=http://localhost:8888/
+      - INSTANCE_NAME=kochwas-search-dev
+    restart: unless-stopped

searxng/settings.yml

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+use_default_settings: true
+server:
+  secret_key: 'dev-secret-change-in-prod'
+  limiter: false
+  image_proxy: false
+  default_http_headers:
+    X-Content-Type-Options: nosniff
+    X-Download-Options: noopen
+    X-Robots-Tag: noindex, nofollow
+search:
+  formats:
+    - html
+    - json
+ui:
+  default_locale: de