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/polygon.py

@@ -0,0 +1,46 @@
+"""Polygon operations routes for ORA Editor."""
+
+from flask import Blueprint, request, jsonify
+import logging
+
+from ora_editor.services import polygon_storage
+
+logger = logging.getLogger(__name__)
+
+polygon_bp = Blueprint('polygon', __name__)
+
+
+@polygon_bp.route('/api/polygon', methods=['POST'])
+def api_polygon():
+    """Store polygon points for overlay."""
+    data = request.get_json()
+    
+    required = ['ora_path', 'points']
+    for field in required:
+        if field not in data:
+            return jsonify({'success': False, 'error': f'Missing {field} parameter'}), 400
+    
+    ora_path = data['ora_path']
+    points = data['points']
+    color = data.get('color', '#FF0000')
+    width = data.get('width', 2)
+    
+    logger.info(f"[POLYGON] Storing polygon: {len(points)} points, color: {color}, width: {width}")
+    
+    polygon_storage.store(ora_path, points, color, width)
+    
+    return jsonify({
+        'success': True,
+        'overlay_url': f'/api/image/polygon?ora_path={ora_path}'
+    })
+
+
+@polygon_bp.route('/api/polygon/clear', methods=['POST'])
+def api_polygon_clear():
+    """Clear stored polygon points."""
+    ora_path = request.json.get('ora_path') if request.data else None
+    
+    if ora_path:
+        polygon_storage.clear(ora_path)
+    
+    return jsonify({'success': True})