feat: Integrate Electric SQL for real-time notifications and enhance PostgreSQL configuration

- Added Electric SQL service to docker-compose for real-time data synchronization.
- Introduced PostgreSQL configuration for logical replication and performance tuning.
- Created scripts for initializing Electric SQL user and electrifying tables.
- Implemented notification model and service in the backend.
- Developed ElectricProvider and useNotifications hook in the frontend for managing notifications.
- Updated environment variables and package dependencies for Electric SQL integration.

surfsense_web/lib/electric/config.ts

@@ -0,0 +1,19 @@
+/**
+ * Electric SQL configuration
+ * This file will be used by @electric-sql/cli to generate the schema
+ */
+
+export const electricConfig = {
+	connection: {
+		host: process.env.ELECTRIC_HOST || 'localhost',
+		port: parseInt(process.env.ELECTRIC_PORT || '5133', 10),
+		database: process.env.POSTGRES_DB || 'surfsense',
+		user: process.env.ELECTRIC_USER || 'electric',
+		password: process.env.ELECTRIC_PASSWORD || 'electric_password',
+	},
+	service: {
+		host: process.env.ELECTRIC_HOST || 'localhost',
+		port: parseInt(process.env.ELECTRIC_PORT || '5133', 10),
+	},
+}
+