feat: create backend project structure

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

imagecreator/backend/app/config.py

@@ -0,0 +1,31 @@
+from pydantic_settings import BaseSettings
+from functools import lru_cache
+
+class Settings(BaseSettings):
+    # Database
+    DATABASE_URL: str = "postgresql://user:pass@localhost:5432/imagecreator"
+
+    # JWT
+    SECRET_KEY: str = "your-secret-key-change-in-production"
+    ALGORITHM: str = "HS256"
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = 30
+    REFRESH_TOKEN_EXPIRE_DAYS: int = 7
+
+    # CORS
+    CORS_ORIGINS: list[str] = ["http://localhost:3000"]
+
+    # LLM API Keys
+    GEMINI_API_KEY: str = ""
+    OPENAI_API_KEY: str = ""
+
+    # Image storage
+    IMAGE_STORAGE_PATH: str = "/app/uploads"
+
+    class Config:
+        env_file = ".env"
+
+@lru_cache()
+def get_settings():
+    return Settings()
+
+settings = get_settings()