fix(docker): upgrade to node:22-alpine to resolve build errors

Dockerfile

@@ -2,7 +2,7 @@
 # Optimized for "Insane Mode" (High Concurrency & Throughput)
 
 # 1. Base Image
-FROM node:20-alpine AS base
+FROM node:22-alpine AS base
 WORKDIR /app
 # Install system utilities for performance tuning
 RUN apk add --no-cache libc6-compat curl bash
@@ -25,6 +25,9 @@ COPY . .
 # Set to 8GB to be safe on most build runners
 ENV NODE_OPTIONS="--max-old-space-size=8192"
 
+# Debug: Check if astro is installed
+RUN npm list astro || true
+
 # Build the application
 RUN npm run build