Fix seven type errors that broke next build

`npm run build` failed on a clean checkout, so nothing on master could be
built for production. `npm run dev` does not hard-fail on type errors, which
is why it went unnoticed.

- state route returned client.perContractFees, which has never existed on
  TradovateClient on any branch; nothing consumed it
- mapFirmConfig omitted bannedSymbols. Type gap only: the trade path calls
  isSymbolBanned() against the DB directly, so bans were always enforced
- initClient's sync callback was sync where the constructor wants
  () => Promise<void>
- accessInfo and ws are assigned during async connect/auth, never in the
  constructor, so they take definite-assignment assertions
- the socket payload's inline entityType union had drifted five members
  behind the indirect-callback union above it, making the 'position' and
  'cashBalance' branches unreachable to the compiler. Both now share a
  TradovateEntityType alias. Type-only: those handlers ran fine at runtime

Behaviour is unchanged throughout.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

lib/tradovate-class.ts

@@ -7,10 +7,27 @@ import { POINT_VALUES } from './trading-logic';
 import { getCachedContract, resolveContracts } from './contract-resolver';
 import { saveDailyPnL, loadDailyPnL, saveAccountMeta, loadAccountMeta, saveFundTransactions, loadFundTransactions } from './db';
 
+/**
+ * Entity types Tradovate sends over the user-sync socket. Keep this as the
+ * single source of truth: the inline socket-payload type and the indirect
+ * callback list previously declared it separately and fell out of sync, which
+ * made the 'position' and 'cashBalance' handlers unreachable to the compiler.
+ */
+type TradovateEntityType =
+    | 'order'
+    | 'orderVersion'
+    | 'auditUserAction'
+    | 'command'
+    | 'commandReport'
+    | 'fill'
+    | 'executionReport'
+    | 'position'
+    | 'cashBalance';
+
 export class TradovateClient {
     private name: string;
     private password: string;
-    private accessInfo: AuthLoginResponse;
+    private accessInfo!: AuthLoginResponse;
     private deviceId = randomUUIDV4();
 
     public accountList: AccountItem[] = [];
@@ -70,7 +87,7 @@ export class TradovateClient {
     public syncComplete = false;
 
 
-    private ws: WebSocket;
+    private ws!: WebSocket;
     private callbackOnSyncRequest: () => Promise<void>;
 
     /** Incrementing ID for outgoing WebSocket messages — ensures concurrent orders don't clobber each other's callbacks. */
@@ -82,15 +99,7 @@ export class TradovateClient {
         [id: number]: (response: any) => void;
     } = {};
     private indirectEventCallbacks: {
-        entityType:
-            | 'order'
-            | 'orderVersion'
-            | 'auditUserAction'
-            | 'command'
-            | 'commandReport'
-            | 'fill'
-            | 'executionReport'
-            | 'cashBalance';
+        entityType: TradovateEntityType;
         eventType: 'Created' | 'Updated';
         // Since the entity is not always the same, we need a validator to check if the response is the one we are looking for
         validator: (response: any) => boolean;
@@ -167,12 +176,7 @@ export class TradovateClient {
                         | {
                               e?: string;
                               d?: {
-                                  entityType:
-                                      | 'order'
-                                      | 'orderVersion'
-                                      | 'auditUserAction'
-                                      | 'command'
-                                      | 'commandReport';
+                                  entityType: TradovateEntityType;
                                   eventType: 'Created' | 'Updated';
                                   entity: any;
                               };