fix(docker): npm ci --include=dev to install devDeps in build stage

Coolify injects ARG NODE_ENV=production causing npm to skip devDependencies.
@tailwindcss/postcss is a devDependency required at build time.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Dockerfile

@@ -4,7 +4,7 @@ FROM base AS deps
 RUN apk add --no-cache libc6-compat
 WORKDIR /app
 COPY package.json package-lock.json* ./
-RUN npm ci
+RUN npm ci --include=dev
 
 FROM base AS builder
 WORKDIR /app