feat: Versionsanzeige (VERSION-Datei, Footer, /api/version, Image-Tag)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

finance/tests/test_gui.py

@@ -33,6 +33,13 @@ def test_import_list_fragment_renders_after_login(client):
     assert "Noch keine Imports" in r.text
 
 
+def test_version_visible(client):
+    r = client.get("/api/version", headers={"Authorization": "Bearer test-key"})
+    assert r.status_code == 200 and r.json()["version"] == "0.2.0"
+    client.post("/login", data={"username": "admin", "password": "geheim"})
+    assert "v0.2.0" in client.get("/").text
+
+
 def test_planning_page_has_all_sections(client):
     client.post("/login", data={"username": "admin", "password": "geheim"})
     r = client.get("/planung")