docs(CLAUDE.md): add code style section aligned with glyphdiff conventions

Dockerfile

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+FROM oven/bun:1-alpine AS base
+
+WORKDIR /app
+
+FROM base AS deps
+COPY package.json package-lock.json* ./
+RUN bun install --frozen-lockfile
+
+FROM base AS builder
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+RUN bun install --frozen-lockfile
+RUN bun run build
+
+FROM base AS runner
+WORKDIR /app
+
+ENV NODE_ENV production
+
+RUN addgroup --system --gid 1001 bun
+RUN adduser --system --uid 1001 bun
+
+COPY --from=builder /app/package.json ./
+COPY --from=builder /app/node_modules ./node_modules
+COPY --from=builder /app/build ./
+
+USER bun
+
+EXPOSE 3000
+
+CMD ["bun", "run", "index.js"]