Initial commit: AI Radio Show web application

- FastAPI backend with multiple TTS providers (Inworld, ElevenLabs, Kokoro, F5-TTS, etc.)
- Web frontend with caller management, music, and soundboard
- Whisper transcription integration
- OpenRouter/Ollama LLM support
- Castopod podcast publishing script

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/config.py

@@ -0,0 +1,41 @@
+"""Configuration settings for the AI Radio Show backend"""
+
+import os
+from pathlib import Path
+from pydantic_settings import BaseSettings
+from dotenv import load_dotenv
+
+# Load .env from parent directory
+load_dotenv(Path(__file__).parent.parent / ".env")
+
+
+class Settings(BaseSettings):
+    # API Keys
+    elevenlabs_api_key: str = os.getenv("ELEVENLABS_API_KEY", "")
+    openrouter_api_key: str = os.getenv("OPENROUTER_API_KEY", "")
+    inworld_api_key: str = os.getenv("INWORLD_API_KEY", "")
+
+    # LLM Settings
+    llm_provider: str = "openrouter"  # "openrouter" or "ollama"
+    openrouter_model: str = "anthropic/claude-3-haiku"
+    ollama_model: str = "llama3.2"
+    ollama_host: str = "http://localhost:11434"
+
+    # TTS Settings
+    tts_provider: str = "kokoro"  # "kokoro", "elevenlabs", "vits", or "bark"
+
+    # Audio Settings
+    sample_rate: int = 24000
+
+    # Paths
+    base_dir: Path = Path(__file__).parent.parent
+    sounds_dir: Path = base_dir / "sounds"
+    music_dir: Path = base_dir / "music"
+    sessions_dir: Path = base_dir / "sessions"
+
+    class Config:
+        env_file = ".env"
+        extra = "ignore"
+
+
+settings = Settings()