feat: Add google-genai & structured output

app/core/config.py

@@ -1,3 +1,4 @@
+from typing import Optional
 from pydantic import Field, computed_field
 from pydantic_settings import BaseSettings, SettingsConfigDict
 
@@ -23,6 +24,9 @@ class Settings(BaseSettings):
     REDIS_PORT: int = Field(default=6379)
     REDIS_DB: int = Field(default=0)
 
+    # Gemini
+    GEMINI_API_KEY: Optional[str] = Field(default=None)
+
     @computed_field
     @property
     def DATABASE_URL(self) -> str: