chore(frontend): migrate from npm to Bun for dependency management and scripts

- Updated README to replace npm commands with Bun equivalents.
- Added `bun.lock` file to track Bun-managed dependencies.

frontend/Dockerfile

@@ -1,16 +1,16 @@
 # Stage 1: Dependencies
-FROM node:20-alpine AS deps
+FROM oven/bun:1-alpine AS deps
 WORKDIR /app
-COPY package.json package-lock.json ./
-RUN npm ci
+COPY package.json bun.lock ./
+RUN bun install --frozen-lockfile
 
 # Stage 2: Builder
-FROM node:20-alpine AS builder
+FROM oven/bun:1-alpine AS builder
 WORKDIR /app
 COPY --from=deps /app/node_modules ./node_modules
 COPY . .
 ENV NEXT_TELEMETRY_DISABLED 1
-RUN npm run build
+RUN bun run build
 
 # Stage 3: Runner
 FROM node:20-alpine AS runner
@@ -33,4 +33,4 @@ EXPOSE 3000
 ENV PORT 3000
 ENV HOSTNAME "0.0.0.0"
 
-CMD ["node", "server.js"]
+CMD ["node", "server.js"]