feat: Implement multi-stage Dockerfile for robust Nuxt build

Dockerfile

@@ -1,4 +1,5 @@
-FROM node:24-alpine
+# Stage 1: Builder
+FROM node:24-alpine AS builder
 
 # Install dumb-init, Python, and build tools for native builds
 RUN apk add --no-cache dumb-init python3 build-base
@@ -9,8 +10,8 @@ WORKDIR /app
 # Copy package files
 COPY package*.json ./
 
-# Install dependencies
-RUN npm install --production
+# Install all dependencies (including dev dependencies for building)
+RUN npm install
 
 # Copy application code
 COPY . .
@@ -18,6 +19,21 @@ COPY . .
 # Build the application
 RUN npm run build
 
+# Stage 2: Runner
+FROM node:24-alpine
+
+# Install dumb-init for signal handling
+RUN apk add --no-cache dumb-init
+
+# Set working directory
+WORKDIR /app
+
+# Copy only production dependencies from builder stage
+COPY --from=builder /app/node_modules ./node_modules
+
+# Copy the built application from builder stage
+COPY --from=builder /app/.output ./.output
+
 # Create data directory and database file for SQLite
 RUN mkdir -p /app/data && touch /app/data/sermons.db