Add NextSnap PWA with photo gallery viewer and continuous capture

Offline-first photo capture app for Nextcloud with:
- Camera capture with continuous mode (auto-reopens after each photo)
- File browser with fullscreen image gallery, swipe navigation, and rename
- Upload queue with background sync engine
- Admin panel for Nextcloud user management
- Service worker for offline-first caching (v13)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/__init__.py

@@ -0,0 +1,30 @@
+from flask import Flask
+from flask_session import Session
+import os
+
+# Initialize Flask-Session
+sess = Session()
+
+def create_app(config_name=None):
+    """Application factory pattern."""
+    app = Flask(__name__)
+    
+    # Load configuration
+    if config_name is None:
+        config_name = os.environ.get('FLASK_ENV', 'development')
+    
+    from config import config
+    app.config.from_object(config.get(config_name, config['default']))
+    
+    # Initialize extensions
+    sess.init_app(app)
+    
+    # Register blueprints
+    from app.routes import health, auth, views, webdav_proxy, admin
+    app.register_blueprint(health.bp)
+    app.register_blueprint(auth.bp)
+    app.register_blueprint(views.bp)
+    app.register_blueprint(webdav_proxy.bp)
+    app.register_blueprint(admin.bp)
+    
+    return app