WebUI Architecture Cleanup (#19541)

* webui: architecture foundation (non-MCP core refactors)

* chore: update webui build output

tools/server/webui/src/lib/services/props.service.ts

@@ -0,0 +1,47 @@
+import { apiFetchWithParams } from '$lib/utils/api-fetch';
+
+export class PropsService {
+	/**
+	 *
+	 *
+	 * Fetching
+	 *
+	 *
+	 */
+
+	/**
+	 * Fetches global server properties from the `/props` endpoint.
+	 * In MODEL mode, returns modalities for the single loaded model.
+	 * In ROUTER mode, returns server-wide settings without model-specific modalities.
+	 *
+	 * @param autoload - If false, prevents automatic model loading (default: false)
+	 * @returns Server properties including default generation settings and capabilities
+	 * @throws {Error} If the request fails or returns invalid data
+	 */
+	static async fetch(autoload = false): Promise<ApiLlamaCppServerProps> {
+		const params: Record<string, string> = {};
+		if (!autoload) {
+			params.autoload = 'false';
+		}
+
+		return apiFetchWithParams<ApiLlamaCppServerProps>('./props', params, { authOnly: true });
+	}
+
+	/**
+	 * Fetches server properties for a specific model (ROUTER mode only).
+	 * Required in ROUTER mode because global `/props` does not include per-model modalities.
+	 *
+	 * @param modelId - The model ID to fetch properties for
+	 * @param autoload - If false, prevents automatic model loading (default: false)
+	 * @returns Server properties specific to the requested model
+	 * @throws {Error} If the request fails, model not found, or model not loaded
+	 */
+	static async fetchForModel(modelId: string, autoload = false): Promise<ApiLlamaCppServerProps> {
+		const params: Record<string, string> = { model: modelId };
+		if (!autoload) {
+			params.autoload = 'false';
+		}
+
+		return apiFetchWithParams<ApiLlamaCppServerProps>('./props', params, { authOnly: true });
+	}
+}