feat: initial release of relaticle/comments

Filament comments package with:
- Polymorphic commenting on any Eloquent model
- Threaded replies with configurable depth
- @mentions with autocomplete and user search
- Emoji reactions with toggle and who-reacted tooltips
- File attachments via Livewire uploads
- Reply and mention notifications via Filament notification system
- Thread subscriptions for notification control
- Real-time broadcasting (opt-in Echo) with polling fallback
- Dark mode support
- CommentsAction, CommentsTableAction, CommentsEntry for Filament integration
- 204 tests, 421 assertions

config/comments.php

@@ -0,0 +1,88 @@
+<?php
+
+use App\Models\User;
+use Relaticle\Comments\Comment;
+use Relaticle\Comments\Mentions\DefaultMentionResolver;
+use Relaticle\Comments\Policies\CommentPolicy;
+
+return [
+    'tables' => [
+        'comments' => 'comments',
+    ],
+
+    'models' => [
+        'comment' => Comment::class,
+    ],
+
+    'commenter' => [
+        'model' => User::class,
+    ],
+
+    'policy' => CommentPolicy::class,
+
+    'threading' => [
+        'max_depth' => 2,
+    ],
+
+    'pagination' => [
+        'per_page' => 10,
+    ],
+
+    'reactions' => [
+        'emoji_set' => [
+            'thumbs_up' => "\u{1F44D}",
+            'heart' => "\u{2764}\u{FE0F}",
+            'celebrate' => "\u{1F389}",
+            'laugh' => "\u{1F604}",
+            'thinking' => "\u{1F914}",
+            'sad' => "\u{1F622}",
+        ],
+    ],
+
+    'mentions' => [
+        'resolver' => DefaultMentionResolver::class,
+        'max_results' => 5,
+    ],
+
+    'editor' => [
+        'toolbar' => [
+            ['bold', 'italic', 'strike', 'link'],
+            ['bulletList', 'orderedList'],
+            ['codeBlock'],
+        ],
+    ],
+
+    'notifications' => [
+        'channels' => ['database'],
+        'enabled' => true,
+    ],
+
+    'subscriptions' => [
+        'auto_subscribe' => true,
+    ],
+
+    'attachments' => [
+        'enabled' => true,
+        'disk' => 'public',
+        'max_size' => 10240,
+        'allowed_types' => [
+            'image/jpeg',
+            'image/png',
+            'image/gif',
+            'image/webp',
+            'application/pdf',
+            'text/plain',
+            'application/msword',
+            'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
+        ],
+    ],
+
+    'broadcasting' => [
+        'enabled' => false,
+        'channel_prefix' => 'comments',
+    ],
+
+    'polling' => [
+        'interval' => '10s',
+    ],
+];