Fix double proxy prefix in API token fetch calls

The proxyFetch() function adds the script root prefix, but Flask's url_for()
already includes the script root when generating URLs. This caused the
proxy path to be duplicated (e.g., /mbetterd/mbetterd/...).

Changed all proxyFetch() calls to use fetch() directly since url_for()
already handles the proxy prefix correctly.

app/templates/main/user_tokens.html

@@ -585,7 +585,8 @@ document.getElementById('createTokenForm').addEventListener('submit', async func
     }
     
     try {
-        const response = await proxyFetch('{{ url_for("main.create_api_token") }}', {
+        // Use fetch directly since url_for() already includes the script root
+        const response = await fetch('{{ url_for("main.create_api_token") }}', {
             method: 'POST',
             headers: {
                 'Content-Type': 'application/json'
@@ -622,7 +623,8 @@ document.getElementById('extendTokenForm').addEventListener('submit', async func
     const days = parseInt(formData.get('days'));
     
     try {
-        const response = await proxyFetch(`{{ url_for("main.extend_api_token", token_id=0) }}`.replace('0', currentTokenId), {
+        // Use fetch directly since url_for() already includes the script root
+        const response = await fetch(`{{ url_for("main.extend_api_token", token_id=0) }}`.replace('0', currentTokenId), {
             method: 'POST',
             headers: {
                 'Content-Type': 'application/json'
@@ -652,7 +654,8 @@ async function revokeToken(tokenId, tokenName) {
     }
     
     try {
-        const response = await proxyFetch(`{{ url_for("main.revoke_api_token", token_id=0) }}`.replace('0', tokenId), {
+        // Use fetch directly since url_for() already includes the script root
+        const response = await fetch(`{{ url_for("main.revoke_api_token", token_id=0) }}`.replace('0', tokenId), {
             method: 'POST'
         });
         
@@ -676,7 +679,8 @@ async function deleteToken(tokenId, tokenName) {
     }
     
     try {
-        const response = await proxyFetch(`{{ url_for("main.delete_api_token", token_id=0) }}`.replace('0', tokenId), {
+        // Use fetch directly since url_for() already includes the script root
+        const response = await fetch(`{{ url_for("main.delete_api_token", token_id=0) }}`.replace('0', tokenId), {
             method: 'DELETE'
         });