Fix backend image: include dist/ in the pnpm-deploy bundle

The 0.1.1 image published with no dist/ at all and crashed on startup
(`Cannot find module '/app/dist/main'`). Cause: pnpm deploy uses pnpm
pack file selection, which honors .gitignore. The repo's root
.gitignore excludes dist/, so pnpm correctly omitted the compiled
JavaScript from the deploy bundle — but that's exactly what the
runtime needs.

Add an explicit `files` field to the backend's package.json listing
dist/ and prisma/. With `files` set, pnpm pack/deploy includes those
paths verbatim regardless of gitignore.

Bump 0.1.1 → 0.1.2; 0.1.1 is now occupied in Harbor by the broken
unrunnable image.

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

tehriehlbudget-backend/package.json

@@ -1,10 +1,14 @@
 {
   "name": "tehriehlbudget-backend",
-  "version": "0.1.1",
+  "version": "0.1.2",
   "description": "",
   "author": "",
   "private": true,
   "license": "UNLICENSED",
+  "files": [
+    "dist",
+    "prisma"
+  ],
   "scripts": {
     "build": "nest build",
     "format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"",