Update backend API configuration and schema for improved functionality

- Modified TypeScript configuration to disable strict mode and allow importing TypeScript extensions.
- Updated Prisma schema to enhance the User model with a new debtAccounts field and refined asset/liability types.
- Adjusted environment variable parsing for PORT to use coercion for better type handling.
- Refactored various controllers and repositories to utilize type imports for better clarity and maintainability.
- Enhanced service layers with new methods for retrieving assets by type and calculating invoice statistics.
- Introduced new types for invoice statuses and asset types to ensure consistency across the application.

backend-api/src/middleware/auth.ts

@@ -1,18 +1,6 @@
-import {FastifyRequest, FastifyReply} from 'fastify';
+import type {FastifyRequest, FastifyReply} from 'fastify';
 import {UnauthorizedError} from '../utils/errors';
 
-/**
- * Extend Fastify Request with user property
- */
-declare module 'fastify' {
-  interface FastifyRequest {
-    user?: {
-      id: string;
-      email: string;
-    };
-  }
-}
-
 /**
  * Authentication Middleware
  * Verifies JWT token and attaches user to request

backend-api/src/middleware/errorHandler.ts

@@ -1,4 +1,4 @@
-import {FastifyError, FastifyReply, FastifyRequest} from 'fastify';
+import type {FastifyError, FastifyReply, FastifyRequest} from 'fastify';
 import {AppError} from '../utils/errors';
 import {ZodError} from 'zod';