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

package.json

@@ -21,7 +21,8 @@
     "profile": "bun --inspect src/index.ts",
     "clean": "rm -rf dist .bun coverage",
     "typecheck": "bun x tsc --noEmit",
-    "preinstall": "bun install --frozen-lockfile"
+    "preinstall": "bun install --frozen-lockfile",
+    "example:speech": "bun run examples/speech-to-text-example.ts"
   },
   "dependencies": {
     "@elysiajs/cors": "^1.2.0",