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-compose.yml

@@ -0,0 +1,81 @@
+version: '3.8'
+
+services:
+  nginx:
+    image: nginx:alpine
+    container_name: kb_nginx
+    ports:
+      - "9700:80"
+    volumes:
+      - ./src:/var/www/html
+      - ./docker/nginx/default.conf:/etc/nginx/conf.d/default.conf
+    depends_on:
+      - php
+    networks:
+      - app-network
+
+  php:
+    build:
+      context: ./docker/php
+      dockerfile: Dockerfile
+    container_name: kb_php
+    volumes:
+      - ./src:/var/www/html
+      - ./docker/php/php.ini:/usr/local/etc/php/php.ini
+    networks:
+      - app-network
+    environment:
+      - DB_HOST=mysql
+      - DB_PORT=3306
+      - DB_DATABASE=${DB_DATABASE:-laravel}
+      - DB_USERNAME=${DB_USERNAME:-root}
+      - DB_PASSWORD=${DB_PASSWORD:-root}
+      - MAIL_HOST=mailhog
+      - MAIL_PORT=1025
+
+  mysql:
+    image: mysql:8.0
+    container_name: kb_mysql
+    ports:
+      - "9702:3306"
+    environment:
+      MYSQL_ROOT_PASSWORD: ${DB_PASSWORD:-root}
+      MYSQL_DATABASE: ${DB_DATABASE:-laravel}
+      MYSQL_USER: ${DB_USERNAME:-laravel_user}
+      MYSQL_PASSWORD: ${DB_PASSWORD:-root}
+    volumes:
+      - mysql-data:/var/lib/mysql
+      - ./docker/mysql/my.cnf:/etc/mysql/conf.d/my.cnf
+    networks:
+      - app-network
+
+  phpmyadmin:
+    image: phpmyadmin:latest
+    container_name: kb_phpmyadmin
+    ports:
+      - "9701:80"
+    environment:
+      PMA_HOST: mysql
+      PMA_PORT: 3306
+      PMA_USER: root
+      PMA_PASSWORD: ${DB_PASSWORD:-root}
+    depends_on:
+      - mysql
+    networks:
+      - app-network
+
+  mailhog:
+    image: mailhog/mailhog:latest
+    container_name: kb_mailhog
+    ports:
+      - "1025:1025"  # SMTP
+      - "9725:8025"  # Web UI
+    networks:
+      - app-network
+
+networks:
+  app-network:
+    driver: bridge
+
+volumes:
+  mysql-data: