Implement ID-based routing and folder auto-generation from titles

Major features:
- Switch from slug-based to ID-based routing (/documents/123)
- Enable title editing with automatic slug/path regeneration
- Auto-generate folder structure from title slashes (e.g., Laravel/Livewire/Components)
- Persist sidebar folder open/close state using localStorage
- Remove slug unique constraint (ID routing makes it unnecessary)
- Implement recursive tree view with multi-level folder support

Architecture changes:
- DocumentService: Add generatePathAndSlug() for title-based path generation
- Routes: Change from {document:slug} to {document} for ID binding
- SidebarTree: Extract recursive rendering to partials/tree-item.blade.php
- Database: Remove unique constraint from documents.slug column

UI improvements:
- Display only last path component in sidebar (Components vs Laravel/Livewire/Components)
- Folder state persists across page navigation via localStorage
- Title field accepts slashes for folder organization

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

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

docker/php/php.ini

@@ -0,0 +1,29 @@
+[PHP]
+; 開発環境用の設定
+display_errors = On
+display_startup_errors = On
+error_reporting = E_ALL
+
+; メモリとアップロード制限
+memory_limit = 512M
+upload_max_filesize = 64M
+post_max_size = 64M
+
+; タイムゾーン設定
+date.timezone = Asia/Tokyo
+
+; セッション設定
+session.gc_maxlifetime = 1440
+session.cookie_httponly = On
+
+; その他の設定
+max_execution_time = 300
+max_input_time = 300
+
+; OPcache設定（パフォーマンス向上）
+opcache.enable = 1
+opcache.memory_consumption = 128
+opcache.interned_strings_buffer = 8
+opcache.max_accelerated_files = 10000
+opcache.revalidate_freq = 0
+opcache.validate_timestamps = 1