fix(web_fetch): support proxy for Jina reader in restricted networks (#3418) (#3430)

* fix(web_fetch): support proxy for Jina reader in restricted networks

The web_fetch tool built a bare httpx.AsyncClient() with no proxy
awareness, so users behind a corporate proxy / in Docker / WSL could
not reach https://r.jina.ai and web_fetch timed out.

- Add optional `proxy` / `trust_env` params to JinaClient.crawl and
  wire them from the `web_fetch` tool config (with type coercion for
  YAML string values).
- Pass internal service hostnames through NO_PROXY in both compose
  files so proxy env inherited via env_file does not break in-cluster
  calls (gateway/provisioner/etc).
- Load proxy vars from .env into the shell in scripts/docker.sh so the
  NO_PROXY interpolation can merge user-provided values on `make` path.
- Document proxy/trust_env options in config.example.yaml.

Closes #3418

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Willem Jiang <willem.jiang@gmail.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

scripts/docker.sh

@@ -15,6 +15,32 @@ DOCKER_DIR="$PROJECT_ROOT/docker"
 # Docker Compose command with project name
 COMPOSE_CMD="docker compose -p deer-flow-dev -f docker-compose-dev.yaml"
 
+load_proxy_env_from_dotenv() {
+    local env_file="$PROJECT_ROOT/.env"
+    local var
+    local line
+    local value
+
+    if [ ! -f "$env_file" ]; then
+        return
+    fi
+
+    for var in HTTP_PROXY HTTPS_PROXY ALL_PROXY NO_PROXY http_proxy https_proxy all_proxy no_proxy; do
+        if [ -z "${!var+x}" ]; then
+            line="$(grep -E "^[[:space:]]*${var}=" "$env_file" | tail -n 1 || true)"
+            if [ -n "$line" ]; then
+                value="${line#*=}"
+                value="${value%\"}"
+                value="${value#\"}"
+                value="${value%\'}"
+                value="${value#\'}"
+                value="${value%$'\r'}"
+                export "${var}=${value}"
+            fi
+        fi
+    done
+}
+
 detect_sandbox_mode() {
     local config_file="$PROJECT_ROOT/config.yaml"
     local sandbox_use=""
@@ -220,6 +246,8 @@ start() {
         fi
     fi
 
+    load_proxy_env_from_dotenv
+
     echo "Building and starting containers..."
     cd "$DOCKER_DIR" && $COMPOSE_CMD up --build -d --remove-orphans $services
     echo ""