feat: Implement Text-to-Speech (TTS) functionality with API endpoints, models, and service integration

app/services/tts/base.py

@@ -0,0 +1,38 @@
+"""Base TTS provider interface."""
+
+from abc import ABC, abstractmethod
+from typing import Any
+
+
+class TTSProvider(ABC):
+    """Abstract base class for TTS providers."""
+
+    @abstractmethod
+    async def generate_speech(self, text: str, **options: Any) -> bytes:
+        """Generate speech from text with provider-specific options.
+
+        Args:
+            text: The text to convert to speech
+            **options: Provider-specific options
+
+        Returns:
+            Audio data as bytes
+        """
+
+    @abstractmethod
+    def get_supported_languages(self) -> list[str]:
+        """Return list of supported language codes."""
+
+    @abstractmethod
+    def get_option_schema(self) -> dict[str, Any]:
+        """Return schema for provider-specific options."""
+
+    @property
+    @abstractmethod
+    def name(self) -> str:
+        """Return the provider name."""
+
+    @property
+    @abstractmethod
+    def file_extension(self) -> str:
+        """Return the default file extension for this provider."""