chore(config): update speaches config and ignore sveltekit dashboard

- Simplified .env.example to use localhost SPEACHES_URL
- Removed unused prod_url from SpeachesSettings config
- Added dashboard node_modules and build dirs to .gitignore
- Streamlines local development setup

.env.example

@@ -22,8 +22,7 @@ GATEWAY_SIP_PORT=5080
 GATEWAY_SIP_DOMAIN=gateway.helu.ca
 
 # --- Speaches STT ---
-SPEACHES_URL=http://perseus.helu.ca:22070
-SPEACHES_PROD_URL=http://pan.helu.ca:22070
+SPEACHES_URL=http://localhost:22070
 SPEACHES_MODEL=whisper-large-v3
 
 # --- Audio Classifier ---