Bump Containerfile to node:24-alpine (node 20 EOL 2026-04)

Containerfile

@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1
 
 # --- build stage: compile TypeScript + better-sqlite3's native binding ---
-FROM node:20-alpine AS build
+FROM node:24-alpine AS build
 WORKDIR /app
 
 # python3/make/g++ are needed for node-gyp to build better-sqlite3 from source
@@ -22,7 +22,7 @@ RUN pnpm build
 RUN pnpm prune --prod
 
 # --- runtime stage ---
-FROM node:20-alpine
+FROM node:24-alpine
 WORKDIR /app
 ENV NODE_ENV=production
 ENV PORT=3000