Add nodes management and initial setup pages

- Implemented nodes management functionality in `nodes.php` including create, update, and delete actions.
- Added form validation and error handling for node operations.
- Created a new setup page in `setup.php` for initial administrator account creation.
- Included user feedback messages for successful operations and errors.
- Designed user interface for both nodes management and setup processes.

pathvector-admin/config/config.php

@@ -0,0 +1,74 @@
+<?php
+/**
+ * Pathvector Admin Configuration
+ * 
+ * Main configuration file for the Pathvector administration dashboard
+ */
+
+return [
+    // Application Settings
+    'app_name' => 'Pathvector Admin',
+    'app_version' => '1.0.0',
+    'debug' => true,
+    
+    // Security
+    'session_lifetime' => 3600, // 1 hour
+    'csrf_token_name' => 'pathvector_csrf_token',
+    
+    // Data Storage
+    'data_dir' => __DIR__ . '/../data',
+    'asn_file' => __DIR__ . '/../data/asns.json',
+    'node_file' => __DIR__ . '/../data/nodes.json',
+    'peer_file' => __DIR__ . '/../data/peers.json',
+    'template_file' => __DIR__ . '/../data/templates.json',
+    'host_file' => __DIR__ . '/../data/hosts.json',
+    'user_file' => __DIR__ . '/../data/users.json',
+    'log_file' => __DIR__ . '/../data/logs.json',
+    'backup_dir' => __DIR__ . '/../data/backups',
+    
+    // Pathvector Settings
+    'pathvector' => [
+        'binary_path' => '/usr/local/bin/pathvector',
+        'config_dir' => '/etc/pathvector',
+        'default_config_path' => '/etc/pathvector/pathvector.yml',
+        'default_output_path' => '/etc/bird/bird.conf',
+        'bird_binary' => '/usr/sbin/bird',
+        'bird_socket' => '/var/run/bird.ctl',
+        'bird_reload_cmd' => 'birdc configure',
+    ],
+    
+    // BIRD 3 Settings
+    'bird' => [
+        'version' => '3',
+        'supported_protocols' => ['bgp', 'static', 'kernel', 'device', 'direct'],
+        'table_types' => ['ipv4', 'ipv6', 'ipv4-multicast', 'ipv6-multicast'],
+    ],
+    
+    // User Roles
+    'roles' => [
+        'admin' => 'Administrator',
+        'operator' => 'Operator',
+        'readonly' => 'Read Only',
+    ],
+    
+    // Default Admin User (change on first login!)
+    'default_admin' => [
+        'username' => 'admin',
+        'password' => 'pathvector', // CHANGE THIS!
+        'role' => 'admin',
+    ],
+    
+    // UI Settings
+    'pagination' => [
+        'per_page' => 25,
+    ],
+    
+    // Primer CSS CDN
+    'primer_css_url' => 'https://unpkg.com/@primer/css@^20.2.4/dist/primer.css',
+    
+    // Log Settings
+    'log' => [
+        'max_entries' => 1000,
+        'levels' => ['info', 'warning', 'error', 'success'],
+    ],
+];