Media browser: recursive scan entire content/ tree, /-media/ URL prefix, editor change detection fix

- handleMediaList() now scans content/ recursively for all media files
- URLs use /-media/ prefix mapping directly to content/ (no special cases)
- index.php: added /-media/ route, kept /-assets/ for backward compat
- editor-toolbar.js: fixed editor.on('change') placement (was inside switchMode)
- content-edit.php and content-new.php: back-btn unsaved-changes detection
- Removed unused __editorCleanup global

README.md

@@ -30,7 +30,7 @@ Een lichtgewicht, file-based content management systeem gebouwd met PHP.
 
 ```
 codepress/
-├── engine/
+├── cms/                        # Core CMS engine
 │   ├── core/
 │   │   ├── config.php          # Configuratie loader
 │   │   └── index.php          # CMS engine
@@ -43,18 +43,17 @@ codepress/
 │       ├── markdown_content.mustache
 │       ├── php_content.mustache
 │       └── html_content.mustache
-├── content/                   # Content bestanden
-│   ├── map1/
-│   │   ├── pagina1.md
-│   │   └── pagina2.php
-│   └── homepage.md
-├── admin-console/              # Admin paneel
+├── admin/                      # Admin paneel
 │   ├── config/
 │   │   ├── app.php            # Admin configuratie
 │   │   └── admin.json         # Gebruikers & security
 │   ├── src/
 │   │   └── AdminAuth.php      # Authenticatie service
 │   └── templates/              # Admin templates
+├── cli/                        # CLI scripts & tests
+│   └── test/
+├── content/                   # Content bestanden
+├── plugins/                    # CMS plugins
 ├── public/                     # Web root
 │   ├── assets/
 │   │   ├── css/
@@ -62,6 +61,7 @@ codepress/
 │   │   └── favicon.svg
 │   ├── index.php              # Website entry point
 │   └── admin.php              # Admin entry point
+├── docs/                       # Documentatie
 ├── config.json                 # Configuratie
 └── README.md
 ```
@@ -74,7 +74,7 @@ codepress/
 {
     "site_title": "CodePress",
     "content_dir": "content",
-    "templates_dir": "engine/templates",
+    "templates_dir": "cms/templates",
     "default_page": "auto",
     "homepage": "homepage",
     "author": {