Fix Docker build and Next.js metadata configuration

- Move themeColor and viewport to separate viewport export in layout.tsx
- Improve Docker build process with npm ci and proper dependency handling
- Add Docker-friendly Next.js configuration settings
- Resolve constructor error and metadata warnings

Dockerfile

@@ -8,21 +8,26 @@ WORKDIR /app
 
 # Copy package files
 COPY package.json package-lock.json* ./
-# Install dependencies but skip Prisma postinstall
-RUN npm install --ignore-scripts
+# Clean install dependencies
+RUN npm ci --only=production --ignore-scripts && npm cache clean --force
 
 # Rebuild the source code only when needed
 FROM base AS builder
 RUN apt-get update && apt-get install -y openssl ca-certificates && rm -rf /var/lib/apt/lists/*
 WORKDIR /app
-COPY --from=deps /app/node_modules ./node_modules
+
+# Copy package files and install all dependencies (including dev)
+COPY package.json package-lock.json* ./
+RUN npm ci --ignore-scripts
+
+# Copy source code
 COPY . .
 
-# Generate Prisma Client for the correct platform (Debian)
-RUN npx prisma generate --generator client
+# Generate Prisma Client for the correct platform
+RUN npx prisma generate
 
 # Build Next.js application
-ENV NEXT_TELEMETRY_DISABLED 1
+ENV NEXT_TELEMETRY_DISABLED=1
 ENV AUTH_TRUST_HOST=true
 RUN npm run build