Enhance API and UI for incident management and live updates

- Added a new endpoint `/api/agg/incidents` to provide a normalized snapshot of incidents for fleet triage, including severity and recommended actions.
- Implemented live event streaming via `/api/live/events` for real-time updates on fleet status and incidents, enhancing observability.
- Updated the Web UI to include dedicated sections for incidents and live updates, improving user navigation and access to critical information.
- Enhanced API documentation to reflect new endpoints and their functionalities, ensuring clarity for developers and users.

web/src/lib/components/app-sidebar.svelte

@@ -9,6 +9,8 @@
 	import NetworkIcon from '@lucide/svelte/icons/network';
 	import SettingsIcon from '@lucide/svelte/icons/settings';
 	import RefreshCwIcon from '@lucide/svelte/icons/refresh-cw';
+	import SirenIcon from '@lucide/svelte/icons/siren';
+	import RadioIcon from '@lucide/svelte/icons/radio';
 	import * as Sidebar from '$lib/components/ui/sidebar/index.js';
 
 	let {
@@ -76,6 +78,26 @@
 						{/snippet}
 					</Sidebar.MenuButton>
 				</Sidebar.MenuItem>
+				<Sidebar.MenuItem>
+					<Sidebar.MenuButton isActive={active('/incidents')} tooltipContent="Incidents">
+						{#snippet child({ props })}
+							<a href="/incidents" {...props}>
+								<SirenIcon />
+								<span>Инциденты</span>
+							</a>
+						{/snippet}
+					</Sidebar.MenuButton>
+				</Sidebar.MenuItem>
+				<Sidebar.MenuItem>
+					<Sidebar.MenuButton isActive={active('/live')} tooltipContent="Live">
+						{#snippet child({ props })}
+							<a href="/live" {...props}>
+								<RadioIcon />
+								<span>Live</span>
+							</a>
+						{/snippet}
+					</Sidebar.MenuButton>
+				</Sidebar.MenuItem>
 			</Sidebar.Menu>
 		</Sidebar.Group>
 		{#if serverAliases.length > 0}