Refactor protocol and utility logic into separate modules

Moved Docker/OCI protocol handling, performance monitoring, security, and validation logic into dedicated modules under src/protocols and src/utils. Updated src/index.js to use these new modules, improving maintainability and separation of concerns. Added pre-computed sorted platform keys for efficient matching in platform config.

test/features/security.test.js

@@ -231,7 +231,7 @@ describe('Security Features', () => {
       if (response.status >= 400) {
         const body = await response.text();
         // Should not expose internal paths, stack traces, or sensitive info
-        expect(body).not.toMatch(/\/[a-zA-Z]:[\\/ /); // Windows paths
+        expect(body).not.toMatch(/\/[a-zA-Z]:[\\/]/); // Windows paths
         expect(body).not.toMatch(/\/home\/[^/]+/); // Unix home paths
         expect(body).not.toMatch(/at [a-zA-Z]+\.[a-zA-Z]+/); // Stack traces
         expect(body).not.toMatch(/Error: .+ at/); // Detailed error messages
@@ -244,6 +244,11 @@ describe('Security Features', () => {
         redirect: 'manual'
       });
 
+      // Should return error or redirect
+      expect([400, 404, 302, 301, 405, 501]).toContain(response.status);
+    });
+  });
+
   describe('CORS Security', () => {
     it('should handle CORS preflight requests securely', async () => {
       const response = await SELF.fetch('https://example.com/gh/test/repo', {