minimize for docker image

Dockerfile

@@ -1,4 +1,36 @@
-# Stage 1: Install dependencies
+# Stage 1: Minify frontend assets
+FROM node:20-alpine AS minifier
+
+WORKDIR /build
+
+# Install minification tools (esbuild for JS, html-minifier-terser for HTML)
+RUN npm install -g esbuild html-minifier-terser
+
+# Copy frontend files
+COPY frontend/ ./frontend/
+
+# Minify JavaScript (esbuild is ~100x faster than terser)
+RUN esbuild frontend/app.js --minify --outfile=frontend/app.js --allow-overwrite && \
+    esbuild frontend/sw.js --minify --outfile=frontend/sw.js --allow-overwrite
+
+# Minify HTML files (handles inline CSS and JS too)
+RUN html-minifier-terser \
+    --collapse-whitespace \
+    --remove-comments \
+    --remove-redundant-attributes \
+    --minify-css true \
+    --minify-js true \
+    -o frontend/index.html \
+    frontend/index.html && \
+    html-minifier-terser \
+    --collapse-whitespace \
+    --remove-comments \
+    --minify-css true \
+    --minify-js true \
+    -o frontend/login.html \
+    frontend/login.html
+
+# Stage 2: Install Python dependencies
 FROM python:3.11-slim AS builder
 
 WORKDIR /app
@@ -13,7 +45,7 @@ RUN pip install --no-cache-dir --upgrade pip && \
     find /install -type d -name "tests" -exec rm -rf {} + 2>/dev/null || true && \
     find /install -type d -name "*.dist-info" -exec rm -rf {}/RECORD {} + 2>/dev/null || true
 
-# Stage 2: Final minimal image
+# Stage 3: Final minimal image
 FROM python:3.11-slim
 
 WORKDIR /app
@@ -21,9 +53,11 @@ WORKDIR /app
 # Copy only installed packages (no pip cache, no build artifacts)
 COPY --from=builder /install /usr/local
 
-# Copy application files
+# Copy minified frontend from minifier stage
+COPY --from=minifier /build/frontend ./frontend
+
+# Copy other application files
 COPY backend ./backend
-COPY frontend ./frontend
 COPY config.yaml .
 COPY VERSION .
 COPY plugins ./plugins
@@ -47,4 +81,3 @@ HEALTHCHECK --interval=60s --timeout=3s --start-period=5s --retries=3 \
 # Run the application (shell form to allow environment variable expansion)
 # Use exec to replace shell with uvicorn (receives SIGTERM directly for graceful shutdown)
 CMD exec uvicorn backend.main:app --host 0.0.0.0 --port $PORT --timeout-graceful-shutdown 2
-