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>

src/public/.htaccess

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+<IfModule mod_rewrite.c>
+    <IfModule mod_negotiation.c>
+        Options -MultiViews -Indexes
+    </IfModule>
+
+    RewriteEngine On
+
+    # Handle Authorization Header
+    RewriteCond %{HTTP:Authorization} .
+    RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
+
+    # Handle X-XSRF-Token Header
+    RewriteCond %{HTTP:x-xsrf-token} .
+    RewriteRule .* - [E=HTTP_X_XSRF_TOKEN:%{HTTP:X-XSRF-Token}]
+
+    # Redirect Trailing Slashes If Not A Folder...
+    RewriteCond %{REQUEST_FILENAME} !-d
+    RewriteCond %{REQUEST_URI} (.+)/$
+    RewriteRule ^ %1 [L,R=301]
+
+    # Send Requests To Front Controller...
+    RewriteCond %{REQUEST_FILENAME} !-d
+    RewriteCond %{REQUEST_FILENAME} !-f
+    RewriteRule ^ index.php [L]
+</IfModule>

src/public/index.php

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+<?php
+
+use Illuminate\Foundation\Application;
+use Illuminate\Http\Request;
+
+define('LARAVEL_START', microtime(true));
+
+// Determine if the application is in maintenance mode...
+if (file_exists($maintenance = __DIR__.'/../storage/framework/maintenance.php')) {
+    require $maintenance;
+}
+
+// Register the Composer autoloader...
+require __DIR__.'/../vendor/autoload.php';
+
+// Bootstrap Laravel and handle the request...
+/** @var Application $app */
+$app = require_once __DIR__.'/../bootstrap/app.php';
+
+$app->handleRequest(Request::capture());

src/public/robots.txt

@@ -0,0 +1,2 @@
+User-agent: *
+Disallow:

src/public/vendor/livewire/manifest.json

@@ -0,0 +1,2 @@
+
+{"/livewire.js":"f084fdfb"}