Add Civitai platform support

Added 'civitai' to the PLATFORMS config and updated tests to include Civitai path transformations. This enables handling of Civitai URLs in the platform configuration and ensures correct path transformation logic.

src/config/platforms.js

@@ -10,6 +10,7 @@ export const PLATFORMS = {
   sf: 'https://sourceforge.net',
   aosp: 'https://android.googlesource.com',
   hf: 'https://huggingface.co',
+  civitai: 'https://civitai.com',
   npm: 'https://registry.npmjs.org',
   pypi: 'https://pypi.org',
   'pypi-files': 'https://files.pythonhosted.org',

test/platforms.test.js

@@ -11,6 +11,7 @@ describe('Platform Configuration', () => {
         'gitea',
         'codeberg',
         'hf',
+        'civitai',
         'npm',
         'pypi',
         'conda',
@@ -79,6 +80,20 @@ describe('Platform Configuration', () => {
       );
     });
 
+    it('should transform Civitai paths correctly', () => {
+      expect(transformPath('/civitai/api/v1/models', 'civitai')).toBe(
+        '/api/v1/models'
+      );
+
+      expect(transformPath('/civitai/api/v1/model-versions/1318', 'civitai')).toBe(
+        '/api/v1/model-versions/1318'
+      );
+
+      expect(transformPath('/civitai/api/download/models/1105', 'civitai')).toBe(
+        '/api/download/models/1105'
+      );
+    });
+
     it('should transform npm paths correctly', () => {
       expect(transformPath('/npm/react/-/react-18.2.0.tgz', 'npm')).toBe(
         '/react/-/react-18.2.0.tgz'