perf: optimize Docker builds with npm ci

Replace npm install with npm ci and optimization flags to fix deployment timeouts:
- Use npm ci for faster, more reliable installs
- Add --prefer-offline to use cached packages
- Add --no-audit and --no-fund to skip unnecessary checks
- Optimize landing.Dockerfile to copy package files before installing

This resolves the Docker build EOF errors during deployment.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

docker/backoffice.Dockerfile

@@ -1,7 +1,7 @@
 FROM node:22-alpine AS deps
 WORKDIR /app
 COPY package.json package-lock.json ./
-RUN npm install
+RUN npm ci --prefer-offline --no-audit --no-fund
 
 FROM node:22-alpine AS builder
 WORKDIR /app

docker/dimentorin.Dockerfile

@@ -1,7 +1,7 @@
 FROM node:22-alpine AS deps
 WORKDIR /app
 COPY package.json package-lock.json ./
-RUN npm install
+RUN npm ci --prefer-offline --no-audit --no-fund
 
 FROM node:22-alpine AS builder
 WORKDIR /app

docker/gacha.Dockerfile

@@ -1,7 +1,7 @@
 FROM node:22-alpine AS deps
 WORKDIR /app
 COPY package.json package-lock.json ./
-RUN npm install
+RUN npm ci --prefer-offline --no-audit --no-fund
 
 FROM node:22-alpine AS builder
 WORKDIR /app

docker/hackathon.Dockerfile

@@ -1,7 +1,7 @@
 FROM node:22-alpine AS deps
 WORKDIR /app
 COPY package.json package-lock.json ./
-RUN npm install
+RUN npm ci --prefer-offline --no-audit --no-fund
 
 FROM node:22-alpine AS builder
 WORKDIR /app

docker/landing.Dockerfile

@@ -1,8 +1,9 @@
 FROM node:22-alpine AS builder
 WORKDIR /app
 
+COPY package.json package-lock.json ./
+RUN npm ci --prefer-offline --no-audit --no-fund
 COPY  . .
-RUN npm install
 RUN npm run landing:build
 
 FROM node:22-alpine AS runner