feat: support Podcast generation

src/podcast/types.py

@@ -0,0 +1,13 @@
+from typing import Literal
+
+from pydantic import BaseModel, Field
+
+
+class ScriptLine(BaseModel):
+    speaker: Literal["male", "female"] = Field(default="male")
+    text: str = Field(default="")
+
+
+class Script(BaseModel):
+    locale: Literal["en", "zh"] = Field(default="en")
+    lines: list[ScriptLine] = Field(default=[])