fix: Remove all remaining Zoho debug log statements

- Removed [HVAC Zoho] production/staging detection logs
- Removed flush rewrite rules debug logs
- Removed test_connection method called log
- Removed OAuth token exchange params log
- Removed all other error_log statements from Zoho admin

This completes the cleanup of production error logs.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

includes/admin/class-zoho-admin.php

@@ -127,8 +127,6 @@ class HVAC_Zoho_Admin {
         // Set staging as opposite of production
         $is_staging = !$is_production;
         
-        error_log('[HVAC Zoho] Is Production: ' . ($is_production ? 'YES' : 'NO'));
-        error_log('[HVAC Zoho] Is Staging: ' . ($is_staging ? 'YES' : 'NO'));
         
         // Get stored credentials
         $client_id = get_option('hvac_zoho_client_id', '');
@@ -500,8 +498,6 @@ class HVAC_Zoho_Admin {
         $oauth_rule_exists = isset($rewrite_rules['^oauth/callback/?$']) || isset($rewrite_rules['oauth/callback/?$']);
         
         // Log for debugging
-        error_log('[HVAC Zoho] Flush rewrite rules result: ' . ($oauth_rule_exists ? 'SUCCESS' : 'FAILED'));
-        error_log('[HVAC Zoho] Total rules after flush: ' . count($rewrite_rules));
         
         wp_send_json_success(array(
             'message' => 'Rewrite rules flushed successfully',
@@ -551,7 +547,6 @@ class HVAC_Zoho_Admin {
 
             // Check if we have the code parameter
             if (isset($_GET['code'])) {
-                error_log('Processing OAuth callback directly from parse_request');
                 $this->process_oauth_callback();
                 exit;
             } else {
@@ -608,7 +603,6 @@ class HVAC_Zoho_Admin {
             wp_die('OAuth callback missing authorization code');
         }
         
-        error_log('OAuth callback received with code: ' . substr($_GET['code'], 0, 20) . '...');
         
         // Get credentials from WordPress options
         $client_id = get_option('hvac_zoho_client_id', '');
@@ -630,7 +624,6 @@ class HVAC_Zoho_Admin {
             'code' => $_GET['code']
         );
         
-        error_log('OAuth token exchange params: ' . json_encode(array(
             'client_id' => substr($client_id, 0, 20) . '...',
             'redirect_uri' => $redirect_uri,
             'code' => substr($_GET['code'], 0, 20) . '...'
@@ -642,7 +635,6 @@ class HVAC_Zoho_Admin {
         ));
         
         if (is_wp_error($response)) {
-            error_log('OAuth token exchange error: ' . $response->get_error_message());
             wp_redirect(admin_url('admin.php?page=hvac-zoho-sync&oauth_error=1&error_msg=' . urlencode($response->get_error_message())));
             exit;
         }
@@ -652,7 +644,6 @@ class HVAC_Zoho_Admin {
 
         // Check for errors in response
         if (isset($token_data['error'])) {
-            error_log('OAuth error: ' . $token_data['error'] . ' - ' . ($token_data['error_description'] ?? ''));
             wp_redirect(admin_url('admin.php?page=hvac-zoho-sync&oauth_error=1&error_msg=' . urlencode($token_data['error'])));
             exit;
         }
@@ -670,17 +661,13 @@ class HVAC_Zoho_Admin {
         // Refresh token might not be returned on subsequent authorizations
         if (isset($token_data['refresh_token']) && !empty($token_data['refresh_token'])) {
             update_option('hvac_zoho_refresh_token', $token_data['refresh_token']);
-            error_log('Refresh token saved successfully');
         } else {
-            error_log('No refresh token in response - checking for existing token');
             $existing_refresh = get_option('hvac_zoho_refresh_token');
             if (empty($existing_refresh)) {
-                error_log('WARNING: No refresh token received and no existing token found');
                 // This is critical - we need a refresh token for long-term access
                 // Store a warning but still complete the flow
                 update_option('hvac_zoho_missing_refresh_token', true);
             } else {
-                error_log('Using existing refresh token');
             }
         }
 
@@ -702,7 +689,6 @@ class HVAC_Zoho_Admin {
      * Test Zoho connection
      */
     public function test_connection() {
-        error_log('test_connection method called');
         
         try {
             check_ajax_referer('hvac_zoho_nonce', 'nonce');
@@ -741,7 +727,6 @@ class HVAC_Zoho_Admin {
             $stored_refresh_token = get_option('hvac_zoho_refresh_token');
             
             if (empty($stored_refresh_token)) {
-                error_log('No stored refresh token found, triggering OAuth authorization');
                 
                 $site_url = get_site_url();
                 $redirect_uri = $site_url . '/oauth/callback';
@@ -780,13 +765,11 @@ class HVAC_Zoho_Admin {
             require_once HVAC_CE_PLUGIN_DIR . 'includes/zoho/class-zoho-crm-auth.php';
             $auth = new HVAC_Zoho_CRM_Auth();
             
-            error_log('Testing API with refresh token: ' . substr($stored_refresh_token, 0, 10) . '...');
             
             // Test API call
             $response = $auth->make_api_request('/settings/modules', 'GET');
             
             if (is_wp_error($response)) {
-                error_log('WordPress HTTP error: ' . $response->get_error_message());
                 wp_send_json_error(array(
                     'message' => 'API Connection Failed',
                     'error' => $response->get_error_message(),
@@ -796,7 +779,6 @@ class HVAC_Zoho_Admin {
             }
 
             if (isset($response['error'])) {
-                error_log('Zoho API error: ' . $response['error']);
                 
                 // Check if it's an invalid token error
                 if (strpos($response['error'], 'invalid') !== false || strpos($response['error'], 'expired') !== false) {
@@ -859,21 +841,18 @@ class HVAC_Zoho_Admin {
                 )
             ));
         } catch (Exception $e) {
-            error_log('Exception in test_connection: ' . $e->getMessage() . ' in ' . $e->getFile() . ':' . $e->getLine());
             wp_send_json_error(array(
                 'message' => 'Connection test failed due to exception',
                 'error' => $e->getMessage(),
                 'file' => $e->getFile() . ':' . $e->getLine()
             ));
         } catch (Error $e) {
-            error_log('PHP Error in test_connection: ' . $e->getMessage() . ' in ' . $e->getFile() . ':' . $e->getLine());
             wp_send_json_error(array(
                 'message' => 'Connection test failed due to PHP error',
                 'error' => $e->getMessage(),
                 'file' => $e->getFile() . ':' . $e->getLine()
             ));
         } catch (Throwable $e) {
-            error_log('Fatal error in test_connection: ' . $e->getMessage() . ' in ' . $e->getFile() . ':' . $e->getLine());
             wp_send_json_error(array(
                 'message' => 'Connection test failed due to fatal error',
                 'error' => $e->getMessage(),