feat: badge versione build in GUI + build.sh con auto-bump

- VERSION (1.0.0) + build.sh: bump patch/minor/major e deploy via docker compose
- Dockerfile: ARG/ENV APP_VERSION + BUILD_TIME (iniettati come build-arg)
- version.build_info(): env in Docker, fallback file VERSION + '(local)' in dev
- GET /api/version; badge #appVersionPill nell'header (tooltip = build time)
- test_version.py: env vs fallback

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/test_version.py

@@ -0,0 +1,25 @@
+"""Unit test per build_info(): env (Docker) vs fallback VERSION file (local)."""
+from __future__ import annotations
+
+from pathlib import Path
+
+from presa_mano.version import build_info
+
+_VERSION_FILE = Path(__file__).resolve().parents[1] / "VERSION"
+
+
+def test_build_info_prefers_env(monkeypatch):
+    monkeypatch.setenv("APP_VERSION", "1.2.3")
+    monkeypatch.setenv("BUILD_TIME", "2026-06-03 14:22 UTC")
+    info = build_info()
+    assert info == {"version": "1.2.3", "build_time": "2026-06-03 14:22 UTC"}
+
+
+def test_build_info_falls_back_to_version_file(monkeypatch):
+    monkeypatch.delenv("APP_VERSION", raising=False)
+    monkeypatch.delenv("BUILD_TIME", raising=False)
+    info = build_info()
+    file_ver = _VERSION_FILE.read_text(encoding="utf-8").strip()
+    assert file_ver in info["version"]
+    assert info["version"].endswith("(local)")
+    assert info["build_time"] == "(local)"