Refactor POST handling.

- Split into admin and user handlers, each admin page gets its own file now
- Enforce role access once for admin POST requests
- Automatically load POST logic for admin-based requests based on the referring page, otherwise automatically load all user request logic
- Add support for using custom POST handlers

post/admin/edit_ai_settings.php

@@ -0,0 +1,26 @@
+<?php
+
+if (isset($_POST['edit_ai_settings'])) {
+
+    validateCSRFToken($_POST['csrf_token']);
+
+    $provider = sanitizeInput($_POST['provider']);
+    if($provider){
+        $ai_enable = 1;
+    } else {
+        $ai_enable = 0;
+    }
+    $model = sanitizeInput($_POST['model']);
+    $url = sanitizeInput($_POST['url']);
+    $api_key = sanitizeInput($_POST['api_key']);
+
+    mysqli_query($mysqli,"UPDATE settings SET config_ai_enable = $ai_enable, config_ai_provider = '$provider', config_ai_model = '$model', config_ai_url = '$url', config_ai_api_key = '$api_key' WHERE company_id = 1");
+
+    //Logging
+    mysqli_query($mysqli,"INSERT INTO logs SET log_type = 'Settings', log_action = 'Edit', log_description = '$session_name edited AI settings', log_ip = '$session_ip', log_user_agent = '$session_user_agent', log_user_id = $session_user_id");
+
+    $_SESSION['alert_message'] = "You updated the AI Settings";
+
+    header("Location: " . $_SERVER["HTTP_REFERER"]);
+
+}