feat: init video presentation agent

surfsense_backend/app/agents/video_presentation/utils.py

@@ -0,0 +1,30 @@
+def get_voice_for_provider(provider: str, speaker_id: int = 0) -> dict | str:
+    """
+    Get the appropriate voice configuration based on the TTS provider.
+
+    Currently single-speaker only (speaker_id=0). Multi-speaker support
+    will be added in a future iteration.
+
+    Args:
+        provider: The TTS provider (e.g., "openai/tts-1", "vertex_ai/test")
+        speaker_id: The ID of the speaker (default 0, single speaker for now)
+
+    Returns:
+        Voice configuration - string for OpenAI, dict for Vertex AI
+    """
+    if provider == "local/kokoro":
+        return "af_heart"
+
+    provider_type = (
+        provider.split("/")[0].lower() if "/" in provider else provider.lower()
+    )
+
+    voices = {
+        "openai": "alloy",
+        "vertex_ai": {
+            "languageCode": "en-US",
+            "name": "en-US-Studio-O",
+        },
+        "azure": "alloy",
+    }
+    return voices.get(provider_type, {})