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/searxng/limiter.toml

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+[botdetection.ip_limit]
+# activate link_token method in the ip_limit method
+link_token = true

docker/searxng/settings.yml

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+use_default_settings: true
+
+general:
+  instance_name: 'searxng'
+
+search:
+  autocomplete: 'google'
+  formats:
+    - html
+    - json
+
+server:
+  secret_key: 'a2fb23f1b02e6ee83875b09826990de0f6bd908b6638e8c10277d415f6ab852b' # Is overwritten by ${SEARXNG_SECRET}
+
+engines:
+  - name: wolframalpha
+    disabled: false

docker/searxng/uwsgi.ini

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+[uwsgi]
+# Who will run the code
+uid = searxng
+gid = searxng
+
+# Number of workers (usually CPU count)
+# default value: %k (= number of CPU core, see Dockerfile)
+workers = %k
+
+# Number of threads per worker
+# default value: 4 (see Dockerfile)
+threads = 4
+
+# The right granted on the created socket
+chmod-socket = 666
+
+# Plugin to use and interpreter config
+single-interpreter = true
+master = true
+plugin = python3
+lazy-apps = true
+enable-threads = 4
+
+# Module to import
+module = searx.webapp
+
+# Virtualenv and python path
+pythonpath = /usr/local/searxng/
+chdir = /usr/local/searxng/searx/
+
+# automatically set processes name to something meaningful
+auto-procname = true
+
+# Disable request logging for privacy
+disable-logging = true
+log-5xx = true
+
+# Set the max size of a request (request-body excluded)
+buffer-size = 8192
+
+# No keep alive
+# See https://github.com/searx/searx-docker/issues/24
+add-header = Connection: close
+
+# uwsgi serves the static files
+static-map = /static=/usr/local/searxng/searx/static
+# expires set to one day
+static-expires = /* 86400
+static-gzip-all = True
+offload-threads = 4