fix: resolve Electron auto-updater 404 errors

- Update repository URL to correct Gitea location
- Disable auto-updates due to Gitea hosting limitations
- Remove GitHub provider configuration from electron-builder
- Add comprehensive documentation for future update strategies
- Fixes HttpError 404 when checking for GitHub releases

The app was trying to check for updates on GitHub but the repository
is hosted on Gitea. Auto-updates are now disabled with manual
distribution as the current update mechanism.

electron/src/index.ts

@@ -4,7 +4,7 @@ import type { MenuItemConstructorOptions } from 'electron';
 import { app, MenuItem, ipcMain, dialog } from 'electron';
 import electronIsDev from 'electron-is-dev';
 import unhandled from 'electron-unhandled';
-import { autoUpdater } from 'electron-updater';
+// import { autoUpdater } from 'electron-updater';
 import { promises as fs } from 'fs';
 import { join } from 'path';
 
@@ -73,10 +73,11 @@ if (electronIsDev) {
 }
 
 // Configure auto-updater
-autoUpdater.on('error', (error) => {
-  console.log('Auto-updater error (suppressed):', error.message);
-  // Don't show error dialogs for update check failures
-});
+// DISABLED: Auto-updates not supported on Gitea hosting
+// autoUpdater.on('error', (error) => {
+//   console.log('Auto-updater error (suppressed):', error.message);
+//   // Don't show error dialogs for update check failures
+// });
 
 // Run Application
 (async () => {
@@ -112,14 +113,15 @@ autoUpdater.on('error', (error) => {
     }
   });
   
+  // Auto-updates disabled - not supported on Gitea hosting
   // Only check for updates in production builds, not in development or AppImage
-  if (!electronIsDev && !process.env.APPIMAGE) {
-    try {
-  autoUpdater.checkForUpdatesAndNotify();
-    } catch (error) {
-      console.log('Update check failed (suppressed):', error);
-    }
-  }
+  // if (!electronIsDev && !process.env.APPIMAGE) {
+  //   try {
+  //     autoUpdater.checkForUpdatesAndNotify();
+  //   } catch (error) {
+  //     console.log('Update check failed (suppressed):', error);
+  //   }
+  // }
 })();
 
 // Handle when all of our windows are close (platforms have their own expectations).