feat: Enhance speech and AI configuration with advanced environment settings

- Update `.env.example` with comprehensive speech and AI configuration options
- Modify Docker Compose speech configuration for more flexible audio and ASR settings
- Enhance Dockerfile to support Python virtual environment and speech dependencies
- Refactor environment loading to use Bun's file system utilities
- Improve device listing tool with more detailed device statistics
- Add support for multiple AI models and dynamic configuration

src/config/loadEnv.ts

@@ -1,5 +1,5 @@
 import { config as dotenvConfig } from "dotenv";
-import fs from "fs";
+import { file } from "bun";
 import path from "path";
 
 /**
@@ -15,7 +15,7 @@ const ENV_FILE_MAPPING: Record<string, string> = {
  * Loads environment variables from the appropriate files based on NODE_ENV.
  * First loads environment-specific file, then overrides with generic .env if it exists.
  */
-export function loadEnvironmentVariables() {
+export async function loadEnvironmentVariables() {
     // Determine the current environment (default to 'development')
     const nodeEnv = (process.env.NODE_ENV || "development").toLowerCase();
 
@@ -29,19 +29,29 @@ export function loadEnvironmentVariables() {
     const envPath = path.resolve(process.cwd(), envFile);
 
     // Load the environment-specific file if it exists
-    if (fs.existsSync(envPath)) {
-        dotenvConfig({ path: envPath });
-        console.log(`Loaded environment variables from ${envFile}`);
-    } else {
-        console.warn(`Environment-specific file ${envFile} not found.`);
+    try {
+        const envFileExists = await file(envPath).exists();
+        if (envFileExists) {
+            dotenvConfig({ path: envPath });
+            console.log(`Loaded environment variables from ${envFile}`);
+        } else {
+            console.warn(`Environment-specific file ${envFile} not found.`);
+        }
+    } catch (error) {
+        console.warn(`Error checking environment file ${envFile}:`, error);
     }
 
     // Finally, check if there is a generic .env file present
     // If so, load it with the override option, so its values take precedence
     const genericEnvPath = path.resolve(process.cwd(), ".env");
-    if (fs.existsSync(genericEnvPath)) {
-        dotenvConfig({ path: genericEnvPath, override: true });
-        console.log("Loaded and overrode with generic .env file");
+    try {
+        const genericEnvExists = await file(genericEnvPath).exists();
+        if (genericEnvExists) {
+            dotenvConfig({ path: genericEnvPath, override: true });
+            console.log("Loaded and overrode with generic .env file");
+        }
+    } catch (error) {
+        console.warn(`Error checking generic .env file:`, error);
     }
 }