Add npm registry URL rewriting and improve formatting

Introduces logic to rewrite npm registry tarball URLs in JSON responses to route through the proxy endpoint, ensuring package names are preserved. Also improves code formatting and consistency across source and test files, and adds related test cases for npm URL rewriting.

test/benchmark/performance.bench.js

@@ -73,7 +73,7 @@ describe('Performance Benchmarks', () => {
   describe('Security Header Processing', () => {
     bench('Security headers addition', async () => {
       const response = await SELF.fetch('https://example.com/gh/test/repo/file.txt');
-      
+
       // Verify headers are present (this adds to processing time)
       response.headers.get('Strict-Transport-Security');
       response.headers.get('X-Frame-Options');
@@ -101,22 +101,26 @@ describe('Performance Benchmarks', () => {
 
   describe('Concurrent Request Handling', () => {
     bench('10 concurrent requests', async () => {
-      const requests = Array(10).fill().map(() =>
-        SELF.fetch('https://example.com/gh/test/repo/file.txt', {
-          method: 'HEAD'
-        })
-      );
-      
+      const requests = Array(10)
+        .fill()
+        .map(() =>
+          SELF.fetch('https://example.com/gh/test/repo/file.txt', {
+            method: 'HEAD'
+          })
+        );
+
       await Promise.all(requests);
     });
 
     bench('50 concurrent requests', async () => {
-      const requests = Array(50).fill().map(() =>
-        SELF.fetch('https://example.com/gh/test/repo/file.txt', {
-          method: 'HEAD'
-        })
-      );
-      
+      const requests = Array(50)
+        .fill()
+        .map(() =>
+          SELF.fetch('https://example.com/gh/test/repo/file.txt', {
+            method: 'HEAD'
+          })
+        );
+
       await Promise.all(requests);
     });
   });
@@ -156,7 +160,9 @@ describe('Performance Benchmarks', () => {
     });
 
     bench('Complex URL parsing', async () => {
-      await SELF.fetch('https://example.com/gh/user/repo/file.txt?ref=feature/branch&path=src/components&line=123#L123');
+      await SELF.fetch(
+        'https://example.com/gh/user/repo/file.txt?ref=feature/branch&path=src/components&line=123#L123'
+      );
     });
   });
 
@@ -166,17 +172,17 @@ describe('Performance Benchmarks', () => {
         method: 'GET',
         headers: {
           'User-Agent': 'Test/1.0',
-          'Accept': '*/*'
+          Accept: '*/*'
         }
       });
-      
+
       // Process the request
       await SELF.fetch(request);
     });
 
     bench('Response object processing', async () => {
       const response = await SELF.fetch('https://example.com/gh/test/repo/file.txt');
-      
+
       // Access various response properties
       response.status;
       response.statusText;
@@ -210,4 +216,4 @@ describe('Performance Benchmarks', () => {
       await SELF.fetch('https://example.com/conda/pkgs/main/linux-64/numpy-1.24.3.conda');
     });
   });
-});
+});