fix(version): inject APP_VERSION via Docker build-arg instead of git describe

In Docker builds, .git directory is not available in the container,
so git describe --tags fails and fallback is '0.0.0'. Now:
- build.sh passes --build-arg APP_VERSION=${tag} to frontend build
- Dockerfile accepts ARG APP_VERSION and sets ENV
- vite.config.js checks process.env.APP_VERSION first, then git describe

docker/all-in-one.Dockerfile

@@ -11,6 +11,8 @@
 
 # ── Stage 1: Build Frontend ────────────────────────────────
 FROM node:20-alpine AS frontend-builder
+ARG APP_VERSION=0.0.0
+ENV APP_VERSION=${APP_VERSION}
 
 WORKDIR /app/frontend
 

docker/frontend.Dockerfile

@@ -10,6 +10,8 @@
 # #endregion docker.frontend.Dockerfile
 
 FROM node:20-alpine AS build
+ARG APP_VERSION=0.0.0
+ENV APP_VERSION=${APP_VERSION}
 WORKDIR /app/frontend
 
 COPY frontend/package*.json ./