fix: Dockerfile copies source before npm ci for postinstall

postinstall runs setup-curl.ts which needs scripts/ directory.
Move COPY before npm ci so the script is available.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Dockerfile

@@ -7,13 +7,12 @@ RUN apt-get update && \
 
 WORKDIR /app
 
-# Install backend dependencies (postinstall downloads curl-impersonate for Linux)
-COPY package*.json ./
-RUN npm ci
-
-# Copy source
+# Copy everything first (postinstall needs scripts/setup-curl.ts)
 COPY . .
 
+# Install backend dependencies (postinstall downloads curl-impersonate)
+RUN npm ci
+
 # Build frontend (Vite → public/)
 RUN cd web && npm ci && npm run build