chore: update smithery dockerfile to be closer to the official one

Author: nirinchev

.smithery/Dockerfile

@@ -2,10 +2,10 @@
 # ----- Build Stage -----
 FROM node:lts-alpine AS builder
 
-RUN adduser -D mcpuser
-USER mcpuser
+RUN addgroup -S mcp && adduser -S mcp -G mcp
+USER mcp
 
-WORKDIR /app
+WORKDIR /home/mcp
 
 # Copy package and configuration
 COPY ../package.json ../package-lock.json ../tsconfig.json ../tsconfig.build.json ./
@@ -20,7 +20,7 @@ RUN npm ci && npm run build
 FROM node:lts-alpine
 
 # Copy built artifacts
-COPY --from=builder /app/dist ./dist
+COPY --from=builder /home/mcp/dist ./dist
 
 # Copy package.json for production install
 COPY ../package.json ../package-lock.json ./