fix: restore working Dockerfile (SearXNG pip install + msgspec + --no-build-isolation)

Dockerfile

@@ -12,13 +12,14 @@ COPY admin-server/ .
 RUN GOPROXY=https://goproxy.cn,direct go mod tidy && CGO_ENABLED=0 go build -trimpath -ldflags="-s -w" -o /out/admin-server .
 
 # ── Stage 2: SearXNG from source ──
-# Build args for proxy (passed at build time)
-ARG HTTP_PROXY=""
-ARG HTTPS_PROXY=""
-
 FROM debian:bookworm-slim AS searxng-build
 
+ARG HTTP_PROXY=http://172.17.0.1:7890
+ARG HTTPS_PROXY=http://172.17.0.1:7890
+
 ENV DEBIAN_FRONTEND=noninteractive
+ENV http_proxy=${HTTP_PROXY}
+ENV https_proxy=${HTTPS_PROXY}
 ENV HTTP_PROXY=${HTTP_PROXY}
 ENV HTTPS_PROXY=${HTTPS_PROXY}
 
@@ -26,16 +27,13 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     python3 python3-pip python3-venv git ca-certificates \
     && rm -rf /var/lib/apt/lists/*
 
-# Install SearXNG dependencies with proxy support
-# Using --retries and longer timeout for reliability
-RUN python3 -m venv /opt/searxng-venv && \
-    /opt/searxng-venv/bin/pip install --upgrade pip setuptools wheel && \
-    /opt/searxng-venv/bin/pip install --retries 5 --timeout 120 \
-        msgspec beautifulsoup4 lxml html5lib flask werkzeug gunicorn \
-        pyyaml python-dateutil flask-babel psutil pygments pymdown-extensions \
-        redis brotli brotli-ffi websocket-client httpx/setuptools && \
-    /opt/searxng-venv/bin/pip install --no-build-isolation \
-        "git+https://github.com/searxng/searxng.git@master"
+RUN git clone --depth 1 https://github.com/searxng/searxng.git /src/searxng \
+    && python3 -m venv /opt/searxng-venv \
+    && /opt/searxng-venv/bin/pip install --upgrade pip setuptools wheel msgspec \
+    && cd /src/searxng \
+    && /opt/searxng-venv/bin/pip install --no-cache-dir -r requirements.txt \
+    && /opt/searxng-venv/bin/pip install --no-cache-dir --no-build-isolation . \
+    && rm -rf /src/searxng
 
 # ── Stage 3: Runtime ──
 FROM debian:bookworm-slim