Bump Node 20 → 22 for native WebSocket support

The deployed backend was crashing at startup with `Node.js 20 detected
without native WebSocket support` from @supabase/realtime-js. Native
WebSocket landed in Node 22.4 — bumping the base image is cleaner than
shimming `ws` as a transport (no extra dep, no constructor wrapper).

Bumped in three places to keep everything aligned:
- tehriehlbudget-backend/Dockerfile (runtime + build stages)
- tehriehlbudget-frontend/Dockerfile (build stage; nginx runtime
  unaffected)
- .gitea/workflows/ci.yml (test + lint jobs use the same Node)

@types/node is already on ^22.10.7, so no type-side changes needed.

Bump backend and frontend to 0.1.6 (frontend forced by per-service
push gate; no functional change).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
 
       - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 22
           cache: pnpm
 
       - name: Install dependencies
@@ -49,7 +49,7 @@ jobs:
 
       - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 22
           cache: pnpm
 
       - name: Install dependencies

tehriehlbudget-backend/Dockerfile

@@ -1,5 +1,5 @@
 # syntax=docker/dockerfile:1.7
-ARG NODE_VERSION=20
+ARG NODE_VERSION=22
 
 FROM node:${NODE_VERSION}-alpine AS builder
 RUN apk add --no-cache libc6-compat openssl

tehriehlbudget-backend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "tehriehlbudget-backend",
-  "version": "0.1.5",
+  "version": "0.1.6",
   "description": "",
   "author": "",
   "private": true,

tehriehlbudget-frontend/Dockerfile

@@ -1,5 +1,5 @@
 # syntax=docker/dockerfile:1.7
-ARG NODE_VERSION=20
+ARG NODE_VERSION=22
 
 FROM node:${NODE_VERSION}-alpine AS deps
 RUN corepack enable && corepack prepare pnpm@9 --activate

tehriehlbudget-frontend/package.json

@@ -1,7 +1,7 @@
 {
   "name": "tehriehlbudget-frontend",
   "private": true,
-  "version": "0.1.5",
+  "version": "0.1.6",
   "type": "module",
   "scripts": {
     "dev": "vite",