feat(proxy): add Traefik version tracking with notifications and dismissible UI warnings

- Add automated Traefik version checking job running weekly on Sundays
- Implement version detection from running containers and comparison with versions.json
- Add notifications across all channels (Email, Discord, Slack, Telegram, Pushover, Webhook) for outdated versions
- Create dismissible callout component with localStorage persistence
- Display cross-branch upgrade warnings (e.g., v3.5 -> v3.6) with changelog links
- Show patch update notifications within same branch
- Add warning icon that appears when callouts are dismissed
- Prevent duplicate notifications during proxy restart by adding restarting parameter
- Fix notification spam with transition-based logic for status changes
- Enable system email settings by default in development mode
- Track last saved/applied proxy settings to detect configuration drift

tests/Unit/ProxyHelperTest.php

@@ -0,0 +1,155 @@
+<?php
+
+use Illuminate\Support\Facades\Log;
+
+beforeEach(function () {
+    // Mock Log facade to prevent actual logging during tests
+    Log::shouldReceive('debug')->andReturn(null);
+    Log::shouldReceive('error')->andReturn(null);
+});
+
+it('parses traefik version with v prefix', function () {
+    $image = 'traefik:v3.6';
+    preg_match('/traefik:(v?\d+\.\d+(?:\.\d+)?|latest)/i', $image, $matches);
+
+    expect($matches[1])->toBe('v3.6');
+});
+
+it('parses traefik version without v prefix', function () {
+    $image = 'traefik:3.6.0';
+    preg_match('/traefik:(v?\d+\.\d+(?:\.\d+)?|latest)/i', $image, $matches);
+
+    expect($matches[1])->toBe('3.6.0');
+});
+
+it('parses traefik latest tag', function () {
+    $image = 'traefik:latest';
+    preg_match('/traefik:(v?\d+\.\d+(?:\.\d+)?|latest)/i', $image, $matches);
+
+    expect($matches[1])->toBe('latest');
+});
+
+it('parses traefik version with patch number', function () {
+    $image = 'traefik:v3.5.1';
+    preg_match('/traefik:(v?\d+\.\d+(?:\.\d+)?|latest)/i', $image, $matches);
+
+    expect($matches[1])->toBe('v3.5.1');
+});
+
+it('parses traefik version with minor only', function () {
+    $image = 'traefik:3.6';
+    preg_match('/traefik:(v?\d+\.\d+(?:\.\d+)?|latest)/i', $image, $matches);
+
+    expect($matches[1])->toBe('3.6');
+});
+
+it('returns null for invalid image format', function () {
+    $image = 'nginx:latest';
+    preg_match('/traefik:(v?\d+\.\d+(?:\.\d+)?|latest)/i', $image, $matches);
+
+    expect($matches)->toBeEmpty();
+});
+
+it('returns null for empty image string', function () {
+    $image = '';
+    preg_match('/traefik:(v?\d+\.\d+(?:\.\d+)?|latest)/i', $image, $matches);
+
+    expect($matches)->toBeEmpty();
+});
+
+it('handles case insensitive traefik image name', function () {
+    $image = 'TRAEFIK:v3.6';
+    preg_match('/traefik:(v?\d+\.\d+(?:\.\d+)?|latest)/i', $image, $matches);
+
+    expect($matches[1])->toBe('v3.6');
+});
+
+it('parses full docker image with registry', function () {
+    $image = 'docker.io/library/traefik:v3.6';
+    preg_match('/traefik:(v?\d+\.\d+(?:\.\d+)?|latest)/i', $image, $matches);
+
+    expect($matches[1])->toBe('v3.6');
+});
+
+it('compares versions correctly after stripping v prefix', function () {
+    $version1 = 'v3.5';
+    $version2 = 'v3.6';
+
+    $result = version_compare(ltrim($version1, 'v'), ltrim($version2, 'v'), '<');
+
+    expect($result)->toBeTrue();
+});
+
+it('compares same versions as equal', function () {
+    $version1 = 'v3.6';
+    $version2 = '3.6';
+
+    $result = version_compare(ltrim($version1, 'v'), ltrim($version2, 'v'), '=');
+
+    expect($result)->toBeTrue();
+});
+
+it('compares versions with patch numbers', function () {
+    $version1 = '3.5.1';
+    $version2 = '3.6.0';
+
+    $result = version_compare($version1, $version2, '<');
+
+    expect($result)->toBeTrue();
+});
+
+it('parses exact version from traefik version command output', function () {
+    $output = "Version:      3.6.0\nCodename:     ramequin\nGo version:   go1.24.10";
+    preg_match('/Version:\s+(\d+\.\d+\.\d+)/', $output, $matches);
+
+    expect($matches[1])->toBe('3.6.0');
+});
+
+it('parses exact version from OCI label with v prefix', function () {
+    $label = 'v3.6.0';
+    preg_match('/(\d+\.\d+\.\d+)/', $label, $matches);
+
+    expect($matches[1])->toBe('3.6.0');
+});
+
+it('parses exact version from OCI label without v prefix', function () {
+    $label = '3.6.0';
+    preg_match('/(\d+\.\d+\.\d+)/', $label, $matches);
+
+    expect($matches[1])->toBe('3.6.0');
+});
+
+it('extracts major.minor branch from full version', function () {
+    $version = '3.6.0';
+    preg_match('/^(\d+\.\d+)\.(\d+)$/', $version, $matches);
+
+    expect($matches[1])->toBe('3.6'); // branch
+    expect($matches[2])->toBe('0');   // patch
+});
+
+it('compares patch versions within same branch', function () {
+    $current = '3.6.0';
+    $latest = '3.6.2';
+
+    $result = version_compare($current, $latest, '<');
+
+    expect($result)->toBeTrue();
+});
+
+it('detects up-to-date patch version', function () {
+    $current = '3.6.2';
+    $latest = '3.6.2';
+
+    $result = version_compare($current, $latest, '=');
+
+    expect($result)->toBeTrue();
+});
+
+it('compares branches for minor upgrades', function () {
+    $currentBranch = '3.5';
+    $newerBranch = '3.6';
+
+    $result = version_compare($currentBranch, $newerBranch, '<');
+
+    expect($result)->toBeTrue();
+});