Adds expense tracking module

Adds a new module for tracking user expenses.

The module includes:
- Configuration settings for the LNbits API endpoint and timeouts.
- An ExpensesAPI service for fetching accounts and submitting expense entries.
- A UI component for adding expenses, including account selection and form input.
- Dependency injection for the ExpensesAPI service.

This allows users to submit expense entries with account selection and reference data, which will be linked to their wallet.

src/app.ts

@@ -16,6 +16,7 @@ import chatModule from './modules/chat'
 import eventsModule from './modules/events'
 import marketModule from './modules/market'
 import walletModule from './modules/wallet'
+import expensesModule from './modules/expenses'
 
 // Root component
 import App from './App.vue'
@@ -43,7 +44,8 @@ export async function createAppInstance() {
     ...chatModule.routes || [],
     ...eventsModule.routes || [],
     ...marketModule.routes || [],
-    ...walletModule.routes || []
+    ...walletModule.routes || [],
+    ...expensesModule.routes || []
   ].filter(Boolean)
 
   // Create router with all routes available immediately
@@ -126,6 +128,13 @@ export async function createAppInstance() {
     )
   }
 
+  // Register expenses module
+  if (appConfig.modules.expenses?.enabled) {
+    moduleRegistrations.push(
+      pluginManager.register(expensesModule, appConfig.modules.expenses)
+    )
+  }
+
   // Wait for all modules to register
   await Promise.all(moduleRegistrations)