feat(service-integrations): phase 2 — integration widget & app form UI

- Add 6 renderer components: StatCard, Gauge, List, Progress, AlertBanner, Chart
- Add IntegrationWidget container with auto-refresh, loading, error states
- Add IntegrationAlertOverlay for layout-level critical alerts
- Add IntegrationConfigFields for dynamic form generation from Zod schemas
- Register integration type in WidgetRenderer
- Extend WidgetCreationForm with integration app/endpoint pickers
- Extend AppForm with integration config section and test connection button
- Add /api/integrations/alerts endpoint

src/routes/api/integrations/alerts/+server.ts

@@ -0,0 +1,55 @@
+import { json } from '@sveltejs/kit';
+import type { RequestHandler } from './$types.js';
+import { success } from '$lib/server/utils/response.js';
+import { prisma } from '$lib/server/prisma.js';
+import * as registry from '$lib/server/integrations/registry.js';
+import * as cache from '$lib/server/integrations/cache.js';
+import { tryDecrypt } from '$lib/server/integrations/encryption.js';
+import type { AlertBannerData } from '$lib/server/integrations/types.js';
+
+export const GET: RequestHandler = async () => {
+	try {
+		const apps = await prisma.app.findMany({
+			where: { integrationEnabled: true, integrationType: { not: null } }
+		});
+
+		const alerts: AlertBannerData[] = [];
+
+		for (const app of apps) {
+			const integration = registry.get(app.integrationType!);
+			if (!integration) continue;
+
+			const alertEndpoints = integration.endpoints.filter((ep) => ep.renderer === 'alert-banner');
+			if (alertEndpoints.length === 0) continue;
+
+			const configJson = tryDecrypt(app.integrationConfig);
+			const config = configJson ? JSON.parse(configJson) : {};
+
+			for (const endpoint of alertEndpoints) {
+				const cacheKey = `${app.id}:${endpoint.id}`;
+				const cached = cache.get<AlertBannerData>(cacheKey);
+				if (cached) {
+					alerts.push(cached);
+					continue;
+				}
+
+				try {
+					const data = await integration.fetchData(app.url, config, endpoint.id);
+					if (data.renderer === 'alert-banner') {
+						const alertData = data.data as AlertBannerData;
+						cache.set(cacheKey, alertData, endpoint.refreshInterval);
+						if (alertData.severity === 'warning' || alertData.severity === 'critical') {
+							alerts.push(alertData);
+						}
+					}
+				} catch {
+					// Skip failed alert fetches
+				}
+			}
+		}
+
+		return json(success(alerts));
+	} catch {
+		return json(success([]));
+	}
+};