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/templates/modals/settings.html

@@ -0,0 +1,23 @@
+<!-- Settings modal for ORA Editor -->
+
+<div x-show="showSettings" @keydown.escape.window="showSettings = false" 
+     class="fixed inset-0 z-50 flex items-center justify-center bg-black bg-opacity-75">
+    <div class="bg-gray-800 rounded-lg p-6 max-w-md w-full mx-4 border border-gray-600">
+        <h2 class="text-xl font-bold mb-4">Settings</h2>
+        
+        <div class="mb-4">
+            <label class="block text-sm text-gray-300 mb-2">ComfyUI Server URL</label>
+            <input 
+                type="text" 
+                x-model="comfyUrl" 
+                placeholder="127.0.0.1:8188" 
+                class="w-full bg-gray-700 border border-gray-600 rounded px-3 py-2 text-white focus:outline-none focus:border-blue-500"
+            >
+        </div>
+        
+        <div class="flex gap-4 justify-end mt-4">
+            <button @click="showSettings = false" class="bg-gray-600 hover:bg-gray-500 px-4 py-2 rounded transition">Cancel</button>
+            <button @click="saveSettings()" class="bg-blue-600 hover:bg-blue-700 px-4 py-2 rounded transition">Save</button>
+        </div>
+    </div>
+</div>