Centralized management of external links (#4471)

Update the desktop guide links to make them platform and locale-aware

Edited by Terry:
Refactor external link management by introducing a centralized
useExternalLink composable with automatic locale and platform detection
for documentation URLs.

- Created useExternalLink composable - A new centralized utility for
managing all external links
- Dynamic docs URL builder (buildDocsUrl) - Automatically constructs
docs.comfy.org URLs with:
  - Locale detection (Chinese vs English)
  - Platform detection (macOS vs Windows for desktop)
  - Flexible path construction with options

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-4471-Add-platform-and-locale-aware-desktop-guide-URL-2346d73d3650815ea4a4dd64be575bbe)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Terry Jia <terryjia88@gmail.com>

src/composables/useCoreCommands.ts

@@ -1,6 +1,7 @@
 import { useCurrentUser } from '@/composables/auth/useCurrentUser'
 import { useFirebaseAuthActions } from '@/composables/auth/useFirebaseAuthActions'
 import { useSelectedLiteGraphItems } from '@/composables/canvas/useSelectedLiteGraphItems'
+import { useExternalLink } from '@/composables/useExternalLink'
 import { useModelSelectorDialog } from '@/composables/useModelSelectorDialog'
 import {
   DEFAULT_DARK_COLOR_PALETTE,
@@ -76,6 +77,7 @@ export function useCoreCommands(): ComfyCommand[] {
   const canvasStore = useCanvasStore()
   const executionStore = useExecutionStore()
   const telemetry = useTelemetry()
+  const { staticUrls, buildDocsUrl } = useExternalLink()
 
   const bottomPanelStore = useBottomPanelStore()
 
@@ -761,10 +763,7 @@ export function useCoreCommands(): ComfyCommand[] {
           is_external: true,
           source: 'menu'
         })
-        window.open(
-          'https://github.com/comfyanonymous/ComfyUI/issues',
-          '_blank'
-        )
+        window.open(staticUrls.githubIssues, '_blank')
       }
     },
     {
@@ -779,7 +778,7 @@ export function useCoreCommands(): ComfyCommand[] {
           is_external: true,
           source: 'menu'
         })
-        window.open('https://docs.comfy.org/', '_blank')
+        window.open(buildDocsUrl('/', { includeLocale: true }), '_blank')
       }
     },
     {
@@ -794,7 +793,7 @@ export function useCoreCommands(): ComfyCommand[] {
           is_external: true,
           source: 'menu'
         })
-        window.open('https://www.comfy.org/discord', '_blank')
+        window.open(staticUrls.discord, '_blank')
       }
     },
     {
@@ -861,7 +860,7 @@ export function useCoreCommands(): ComfyCommand[] {
           is_external: true,
           source: 'menu'
         })
-        window.open('https://forum.comfy.org/', '_blank')
+        window.open(staticUrls.forum, '_blank')
       }
     },
     {