Fix Docker build: install devDeps (vite/tsx) and use Node 22

npm ci ran with NODE_ENV=production (Coolify build arg) which skipped devDeps,
so vite was missing. Force --include=dev. Bump base image to node:22.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Dockerfile

@@ -2,7 +2,7 @@
 # Builds the Vite frontend and runs the Express backend, which serves both the
 # API (/api), uploaded files (/storage), and the built frontend (SPA).
 
-FROM node:20-bookworm-slim
+FROM node:22-bookworm-slim
 
 WORKDIR /app
 
@@ -11,8 +11,10 @@ RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates
     && rm -rf /var/lib/apt/lists/*
 
 # Install dependencies (full install — tsx/vite are needed for build & runtime)
+# --include=dev: build needs vite/tsx (devDeps); Coolify sets NODE_ENV=production
+# during build which would otherwise skip them.
 COPY package.json package-lock.json .npmrc ./
-RUN npm ci --legacy-peer-deps
+RUN npm ci --include=dev --legacy-peer-deps
 
 # Copy source and build the frontend
 COPY . .