fix(docker): restore lockfile (npm 10) + npm ci for reliable builds

.gitignore

@@ -85,5 +85,4 @@ graphify-out/*
 .script/
 .codegraph/
 .PR/
-.next-analyze/*
+.next-analyze/*
-package-lock.json

Dockerfile

@@ -7,9 +7,9 @@ FROM base AS builder
 
 RUN apk --no-cache upgrade && apk --no-cache add python3 make g++ linux-headers
 
-COPY package.json ./
+COPY package.json package-lock.json ./
 RUN --mount=type=cache,target=/root/.npm \
-  npm install
+  npm ci
 
 COPY . ./
 ENV NEXT_TELEMETRY_DISABLED=1