[BACKEND] Initialize Go backend structure and dependencies (#23)

Dockerfile.frontend

@@ -1,37 +1,33 @@
 # ==========================================
-# Chat Switchboard Frontend Dockerfile
+# Chat Switchboard - Frontend Dockerfile
+# ==========================================
+# Static SPA served by nginx. No API proxy —
+# in cluster mode, the Ingress routes /api/ to
+# the backend service directly.
+# Also used for the lite (unmanaged) deployment.
 # ==========================================
 
-# Build stage - using alpine, no Node.js needed (build.sh is just bash)
+# Build stage
 FROM alpine:3.19 AS builder
 
 WORKDIR /app
-
-# Install bash and required tools
 RUN apk add --no-cache bash coreutils
 
-# Copy build script and source
 COPY build.sh ./
 COPY src ./src
 
-# Make build script executable and run it
 RUN chmod +x build.sh && ./build.sh
 
 # Production stage
-FROM nginx:alpine AS production
+FROM nginx:alpine
 
-# Copy custom nginx config
-COPY nginx.conf /etc/nginx/conf.d/default.conf
+# Static-only nginx config (no /api/ proxy)
+COPY nginx.frontend.conf /etc/nginx/conf.d/default.conf
 
-# Copy built standalone files
+# Built SPA files
 COPY --from=builder /app/standalone /usr/share/nginx/html
 
-# Expose port
 EXPOSE 80
 
-# Health check
 HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
     CMD wget --no-verbose --tries=1 --spider http://localhost/ || exit 1
-
-# Run nginx
-CMD ["nginx", "-g", "daemon off;"]