feat(service-integrations): phase 1 — integration architecture foundation

- Add Integration interfaces, registry, cache, encryption, and base helpers
- Add integrationType, integrationConfig, integrationEnabled to App model
- Add integration widget type to constants and validators
- Add integration fields to AppRecord, CreateAppInput, UpdateAppInput
- Update appService with encryption/decryption for integration config
- Add API routes: list integrations, test connection, fetch endpoint data

src/lib/utils/validators.ts

@@ -74,7 +74,10 @@ export const createAppSchema = z.object({
 	healthcheckInterval: z.number().int().min(30).max(86400).optional(),
 	healthcheckMethod: z.enum([HealthcheckMethod.GET, HealthcheckMethod.HEAD]).optional(),
 	healthcheckExpectedStatus: z.number().int().min(100).max(599).optional(),
-	healthcheckTimeout: z.number().int().min(1000).max(30000).optional()
+	healthcheckTimeout: z.number().int().min(1000).max(30000).optional(),
+	integrationType: z.string().max(50).nullable().optional(),
+	integrationConfig: z.string().max(10000).nullable().optional(),
+	integrationEnabled: z.boolean().optional()
 });
 
 export const updateAppSchema = z.object({
@@ -89,7 +92,10 @@ export const updateAppSchema = z.object({
 	healthcheckInterval: z.number().int().min(30).max(86400).optional(),
 	healthcheckMethod: z.enum([HealthcheckMethod.GET, HealthcheckMethod.HEAD]).optional(),
 	healthcheckExpectedStatus: z.number().int().min(100).max(599).optional(),
-	healthcheckTimeout: z.number().int().min(1000).max(30000).optional()
+	healthcheckTimeout: z.number().int().min(1000).max(30000).optional(),
+	integrationType: z.string().max(50).nullable().optional(),
+	integrationConfig: z.string().max(10000).nullable().optional(),
+	integrationEnabled: z.boolean().optional()
 });
 
 // --- Board ---
@@ -185,7 +191,8 @@ const allWidgetTypes = [
 	WidgetType.MARKDOWN,
 	WidgetType.METRIC,
 	WidgetType.LINK_GROUP,
-	WidgetType.CAMERA
+	WidgetType.CAMERA,
+	WidgetType.INTEGRATION
 ] as const;
 
 export const createWidgetSchema = z.object({
@@ -371,6 +378,12 @@ export const cameraWidgetConfigSchema = z.object({
 	aspectRatio: z.string().max(20).optional()
 });
 
+export const integrationWidgetConfigSchema = z.object({
+	appId: z.string().min(1, 'App ID is required'),
+	endpointId: z.string().min(1, 'Endpoint ID is required'),
+	refreshInterval: z.number().int().min(5).max(3600).optional()
+});
+
 // --- New entity schemas for Phases 4-7 ---
 
 export const createTagSchema = z.object({