```

Remove unused isValidHttpUrl function and related tests

Remove commented-out model validation regex from constants
```

tests/utils.test.ts

@@ -7,7 +7,6 @@ import {
   validateModelName,
   validatePluginSettings,
   safeParseJson,
-  isValidHttpUrl,
 } from '../src/utils';
 
 describe('Validation Functions', () => {
@@ -185,23 +184,6 @@ describe('Validation Functions', () => {
       expect(() => safeParseJson(123 as any)).toThrow('Input must be a string');
     });
   });
-
-  describe('isValidHttpUrl', () => {
-    it('should accept valid HTTP URLs', () => {
-      expect(isValidHttpUrl('http://localhost:11434')).toBe(true);
-      expect(isValidHttpUrl('https://example.com')).toBe(true);
-    });
-
-    it('should reject non-HTTP URLs', () => {
-      expect(isValidHttpUrl('ftp://example.com')).toBe(false);
-      expect(isValidHttpUrl('file:///path')).toBe(false);
-    });
-
-    it('should reject invalid URLs', () => {
-      expect(isValidHttpUrl('not-a-url')).toBe(false);
-      expect(isValidHttpUrl('')).toBe(false);
-    });
-  });
 });
 
 describe('Logger', () => {