Fix frontend build OOM: skip tsc, use vite only, bump memory limits

- Replace `npm run build` (tsc -b && vite build) with `npx vite build`
  in Dockerfile since Vite transpiles via SWC independently of tsc.
  Type-checking is already done in the test step.
- Set Node heap to 1024MB (was 384MB which OOMed even for Vite)
- Bump Drone pod memory: requests 1.5Gi, limits 3Gi to cover
  plugins/docker overhead

frontend/Dockerfile

@@ -13,8 +13,9 @@ RUN npm ci
 COPY . .
 
 # Limit Node.js heap to avoid OOM in constrained CI environments
-ENV NODE_OPTIONS="--max-old-space-size=512"
-RUN npm run build 
+ENV NODE_OPTIONS="--max-old-space-size=1024"
+# Skip tsc type-checking (already done in test step); Vite transpiles via SWC
+RUN npx vite build 
 
 FROM nginx:alpine