Revert "npm login" (#4299)

Reverts Stirling-Tools/Stirling-PDF#4296

docker/frontend/Dockerfile

@@ -6,32 +6,14 @@ WORKDIR /app
 # Copy package files
 COPY frontend/package*.json ./
 
-# Install dependencies (uses .npmrc secret if available, otherwise anonymous)
-RUN --mount=type=secret,id=npmrc \
-    set -e && \
-    if [ -s /run/secrets/npmrc ]; then \
-      echo "Using authenticated npm registry" && \
-      echo "$(cat /run/secrets/npmrc)" > /root/.npmrc; \
-    else \
-      echo "Using anonymous npm registry (no token provided)"; \
-    fi && \
-    npm ci --loglevel=warn && \
-    rm -f /root/.npmrc
+# Install dependencies
+RUN npm ci
 
 # Copy source code
 COPY frontend .
 
-# Build the application (uses .npmrc secret if available, otherwise anonymous)
-RUN --mount=type=secret,id=npmrc \
-    set -e && \
-    if [ -s /run/secrets/npmrc ]; then \
-      echo "Using authenticated npm registry for build" && \
-      echo "$(cat /run/secrets/npmrc)" > /root/.npmrc; \
-    else \
-      echo "Using anonymous npm registry for build (no token provided)"; \
-    fi && \
-    npm run build && \
-    rm -f /root/.npmrc
+# Build the application
+RUN npm run build
 
 # Production stage
 FROM nginx:alpine