fix: Update Dockerfiles to use git.spdy.io registry

backend/Dockerfile

@@ -1,6 +1,6 @@
 # Build stage
-# Image: code.cannabrands.app/creationshop/dispensary-scraper
-FROM code.cannabrands.app/creationshop/node:20-slim AS builder
+# Image: git.spdy.io/creationshop/dispensary-scraper
+FROM git.spdy.io/creationshop/node:20-slim AS builder
 
 # Install build tools for native modules (bcrypt, sharp)
 RUN apt-get update && apt-get install -y \
@@ -27,7 +27,7 @@ RUN npm run build
 RUN npm prune --production
 
 # Production stage
-FROM code.cannabrands.app/creationshop/node:20-slim
+FROM git.spdy.io/creationshop/node:20-slim
 
 # Build arguments for version info
 ARG APP_BUILD_VERSION=dev