Fix asset fetch paths for GitHub Pages subpath deployment

Use import.meta.env.BASE_URL instead of hardcoded '/' for fetching
workflow JSON and tooltips from public/. Vite sets this to '/comfy-webui/'
in production builds, resolving 404s on GitHub Pages.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Geoff Smith

src/components/Tooltip.jsx

@@ -8,7 +8,7 @@ let tooltipFetchPromise = null;
 function loadTooltips() {
   if (tooltipCache) return Promise.resolve(tooltipCache);
   if (tooltipFetchPromise) return tooltipFetchPromise;
-  tooltipFetchPromise = fetch('/tooltips.json')
+  tooltipFetchPromise = fetch(`${import.meta.env.BASE_URL}tooltips.json`)
     .then((res) => res.json())
     .then((data) => {
       tooltipCache = data;

src/services/mfs-workflow-builder.js

@@ -12,7 +12,7 @@ let cachedWorkflow = null;
  */
 export async function loadMFSWorkflow() {
   if (cachedWorkflow) return cachedWorkflow;
-  const response = await fetch('/medium_format_studio_api.json');
+  const response = await fetch(`${import.meta.env.BASE_URL}medium_format_studio_api.json`);
   if (!response.ok) {
     throw new Error(`Failed to load MFS workflow: ${response.status}`);
   }

src/services/workflow-loader.js

@@ -7,7 +7,7 @@ import { NODE_IDS } from '../utils/constants';
 export async function loadWorkflow() {
   try {
     // Use API format workflow (not frontend format)
-    const response = await fetch('/image_flux2_klein_text_to_image_api.json');
+    const response = await fetch(`${import.meta.env.BASE_URL}image_flux2_klein_text_to_image_api.json`);
     if (!response.ok) {
       throw new Error(`HTTP error! status: ${response.status}`);
     }