chore: replace pnpm with bun across the project

Dockerfile

@@ -1,16 +1,15 @@
-FROM node:22-alpine AS base
+FROM oven/bun:latest AS base
 
-RUN corepack enable && corepack prepare pnpm@latest --activate
 WORKDIR /app
 
 # Install dependencies
-COPY package.json pnpm-lock.yaml ./
+COPY package.json bun.lock ./
 COPY patches ./patches
-RUN pnpm install --frozen-lockfile
+RUN bun install --frozen-lockfile
 
 # Build the SvelteKit app with adapter-node
 COPY . .
-RUN pnpm run build:server
+RUN bun run build:server
 
 # Production image
 FROM node:22-alpine AS production