fix(xray): refuse geodata settings xray-core 26.10.29 refuses at startup

xray-core 26.10.29 (#7267) checks a scheduled geodata section when the
core starts: at most 100 assets, every file a .dat, a cron it can parse
and an @every interval of at least a minute. A refusal there stops the
core and every inbound with it, and the panel's own file-name pattern
still let any extension through.

The geodata editor now requires a .dat file name, and the template save
path applies the same checks the core does. The invalid-file hint names
the .dat requirement in all 14 locales.

frontend/src/pages/index/GeodataSection.tsx

@@ -19,8 +19,8 @@ interface GeodataSectionProps {
 }
 
 const DEFAULT_CRON = '0 4 * * *';
-// Xray resolves `file` inside its asset directory; plain file names only.
-const FILE_NAME_PATTERN = /^[A-Za-z0-9._-]+$/;
+// Xray resolves `file` inside its asset directory; since 26.10.29 a scheduled one must be .dat.
+const FILE_NAME_PATTERN = /^[A-Za-z0-9._-]+\.dat$/i;
 
 function fileNameFromUrl(url: string): string {
   try {

frontend/src/test/geodata-section.test.tsx

@@ -76,4 +76,33 @@ describe('GeodataSection', () => {
       }
     });
   });
+
+  // xray-core 26.10.29 refuses a scheduled asset whose file is not .dat when it starts.
+  it('refuses to save a scheduled asset whose file is not .dat', async () => {
+    const post = vi.spyOn(HttpUtil, 'post').mockResolvedValue(
+      new Msg(
+        true,
+        '',
+        JSON.stringify({
+          xraySetting: {
+            outbounds: [],
+            geodata: { cron: '0 4 * * *', assets: [CUSTOM_SOURCE] },
+          },
+          geodataSources: [],
+        }),
+      ),
+    );
+    const user = userEvent.setup();
+
+    render(<GeodataSection active onBusy={vi.fn()} onClose={vi.fn()} />);
+
+    const file = await screen.findByDisplayValue(CUSTOM_SOURCE.file);
+    await user.clear(file);
+    await user.type(file, 'geosite_custom.mmdb');
+    await user.click(screen.getByRole('button', { name: 'Save & Restart Xray' }));
+
+    expect(await screen.findByText(/File names must be/)).toBeTruthy();
+    expect(screen.queryByText('Save geodata settings?')).toBeNull();
+    expect(post).toHaveBeenCalledTimes(1);
+  });
 });