feat(speech): enhance speech configuration and example integration

- Add comprehensive speech configuration in .env.example and app config
- Update Docker speech Dockerfile for more flexible model handling
- Create detailed README for speech-to-text examples
- Implement example script demonstrating speech features
- Improve speech service initialization and configuration management

src/speech/types.ts

@@ -0,0 +1,20 @@
+import { EventEmitter } from "events";
+
+export interface IWakeWordDetector {
+    initialize(): Promise<void>;
+    shutdown(): Promise<void>;
+    startListening(): Promise<void>;
+    stopListening(): Promise<void>;
+}
+
+export interface ISpeechToText extends EventEmitter {
+    initialize(): Promise<void>;
+    shutdown(): Promise<void>;
+    transcribe(audioData: Buffer): Promise<string>;
+}
+
+export interface SpeechToTextConfig {
+    modelPath: string;
+    modelType: string;
+    containerName?: string;
+}