Add SemVer VERSION, Jenkins CI/CD, and release 0.1.1.

Ship Harbor/Hub push with latest+version tags, deploy to ovirt.devops.org.ru, and show the package version badge in Help → About.

app/main.py

@@ -15,6 +15,7 @@ from app.lifespan import DatabaseFactory, create_lifespan, default_database_fact
 from app.logging import configure_logging
 from app.observability.health import router as health_router
 from app.ovirt.mount import mount_ovirt_routes
+from app.version import get_app_version
 from app.web.routes import router as web_router
 
 
@@ -28,7 +29,7 @@ def create_app(
     configure_logging(resolved.log_level)
     app = FastAPI(
         title=resolved.app_name,
-        version="0.1.0",
+        version=get_app_version(),
         openapi_tags=openapi_tag_metadata(),
         lifespan=create_lifespan(resolved, database_factory, ()),
     )