fix(sync): move typescript to dependencies to fix Docker build

npm silently skips devDependencies in some Alpine+npm combinations,
causing tsc to be missing even after npm install. Moving typescript
to regular dependencies guarantees it is always installed and its
.bin symlink is created regardless of NODE_ENV.

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

sync/Dockerfile

@@ -6,7 +6,7 @@ COPY package*.json .npmrc ./
 RUN npm install
 COPY tsconfig.json ./
 COPY src ./src
-RUN ./node_modules/.bin/tsc && npm prune --production
+RUN npm run build && npm prune --production
 
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