feat: integrate llm-backed routing with fallback

tests/stubs/nuxt-imports.ts

@@ -0,0 +1,16 @@
+export function useRuntimeConfig() {
+    return {
+        openaiKey: process.env.OPENAI_API_KEY || '',
+        openaiProject: process.env.OPENAI_PROJECT || '',
+        openaiBaseUrl: process.env.OPENAI_BASE_URL || '',
+        llmModel: process.env.OPENAI_LLM_MODEL || 'gpt-5-nano',
+        ttsModel: process.env.OPENAI_TTS_MODEL || 'tts-1',
+        defaultVoiceId: process.env.OPENAI_VOICE_ID || 'alloy',
+        openaipApiKey: process.env.OPENAIP_API_KEY || '',
+        usePiper: false,
+        piperPort: 5001,
+        useSpeaches: false,
+        speachesBaseUrl: '',
+        speechModelId: 'speaches-ai/piper-en_US-ryan-low',
+    }
+}