feat(trpc): implement tRPC integration for accounts module

- Add tRPC server setup with NestJS (nestjs-trpc)
- Create AccountsTrpcRouter with CRUD operations
- Add tRPC client configuration in webapp
- Create tRPC React hooks for accounts module
- Replace existing REST hooks with tRPC hooks across 35+ files
- Maintain backward compatibility with existing REST API
- Add proper cache invalidation for mutations

New files:
- packages/server/src/modules/Trpc/*
- packages/webapp/src/trpc.ts
- packages/webapp/src/hooks/trpc/*
- shared/bigcapital-utils/src/trpc.ts

Dependencies added:
- @trpc/server, @trpc/client, @trpc/react-query
- nestjs-trpc, superjson
- @tanstack/react-query

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

packages/webapp/src/trpc.ts

@@ -0,0 +1,42 @@
+import { createTRPCReact } from '@trpc/react-query';
+import { httpBatchLink } from '@trpc/client';
+import superjson from 'superjson';
+import { store } from '@/store/createStore';
+import { tanstackQueryClient } from '@/hooks/query/base';
+
+// Define the AppRouter type - this will be imported from the server package
+// For now, we use any until the server exports the proper types
+export type AppRouter = any;
+
+export const trpc = createTRPCReact<AppRouter>();
+
+export function getAuthHeaders() {
+  const state = store.getState();
+  const { token, organizationId } = state.authentication;
+  const headers: Record<string, string> = {};
+
+  if (token) {
+    headers['x-access-token'] = token;
+  }
+  if (organizationId) {
+    headers['organization-id'] = organizationId.toString();
+  }
+  headers['Accept-Language'] = 'en';
+
+  return headers;
+}
+
+export const trpcClient = trpc.createClient({
+  transformer: superjson,
+  links: [
+    httpBatchLink({
+      url: '/api/trpc',
+      headers() {
+        return getAuthHeaders();
+      },
+    }),
+  ],
+});
+
+// Export the QueryClient for use in the TRPCProvider
+export const queryClient = tanstackQueryClient;