🔉 feat: TTS/STT rate limiters (#2925)

* fix: remove double initialization of speech routes

* refactor(useMessageHelpers): more consistent latestMessage updates based on unique textKey and early returns when setting

* feat: TTS/STT rate limiters

* chore: remove console log

* fix: make modular chat true by default

client/src/utils/messages.ts

@@ -0,0 +1,26 @@
+import { ContentTypes } from 'librechat-data-provider';
+import type { TMessage } from 'librechat-data-provider';
+
+export const getLengthAndFirstFiveChars = (str?: string) => {
+  const length = str ? str.length : 0;
+  const firstFiveChars = str ? str.substring(0, 5) : '';
+  return `${length}${firstFiveChars}`;
+};
+
+export const getLatestText = (message?: TMessage | null) => {
+  if (!message) {
+    return '';
+  }
+  if (message.text) {
+    return message.text;
+  }
+  if (message.content?.length) {
+    for (let i = message.content.length - 1; i >= 0; i--) {
+      const part = message.content[i];
+      if (part.type === ContentTypes.TEXT && part[ContentTypes.TEXT]?.value?.length > 0) {
+        return part[ContentTypes.TEXT].value;
+      }
+    }
+  }
+  return '';
+};