Restructure ORA editor into modular blueprints with browse dialog

- Split app.py into route blueprints (files, layers, images, polygon, mask, krita)
- Create services layer (polygon_storage, comfyui, file_browser)
- Extract config constants to config.py
- Split templates into Jinja partials (base, components, modals)
- Add browse dialog for visual file navigation
- Add /api/browse endpoint for directory listing

tools/ora_editor/routes/__init__.py

@@ -0,0 +1,17 @@
+"""Route blueprints for ORA Editor."""
+
+from .files import files_bp
+from .layers import layers_bp
+from .images import images_bp
+from .polygon import polygon_bp
+from .mask import mask_bp
+from .krita import krita_bp
+
+__all__ = [
+    'files_bp',
+    'layers_bp',
+    'images_bp',
+    'polygon_bp',
+    'mask_bp',
+    'krita_bp'
+]