feat: create backend project structure

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

imagecreator/backend/Dockerfile

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+# TODO: Dockerfile will be implemented in a later task

imagecreator/backend/app/__init__.py

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+"""ImageCreator backend application."""

imagecreator/backend/app/api/__init__.py

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+"""API module."""

imagecreator/backend/app/api/deps.py

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+"""API dependencies placeholder."""

imagecreator/backend/app/config.py

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+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()

imagecreator/backend/app/core/__init__.py

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+"""Core module."""

imagecreator/backend/app/core/security.py

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+"""Security utilities placeholder."""

imagecreator/backend/app/database.py

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+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker, declarative_base
+
+from app.config import settings
+
+engine = create_engine(settings.DATABASE_URL, pool_pre_ping=True)
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+Base = declarative_base()
+
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()

imagecreator/backend/app/main.py

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+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from app.api import auth, users, images, history
+from app.config import settings
+from app.database import engine
+from app.models import user, history as history_model
+
+app = FastAPI(title="ImageCreator API", version="1.0.0")
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=settings.CORS_ORIGINS,
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+app.include_router(auth.router, prefix="/api/auth", tags=["auth"])
+app.include_router(users.router, prefix="/api/users", tags=["users"])
+app.include_router(images.router, prefix="/api/images", tags=["images"])
+app.include_router(history.router, prefix="/api/history", tags=["history"])
+
+@app.get("/health")
+def health_check():
+    return {"status": "ok"}

imagecreator/backend/app/models/__init__.py

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+"""Models module."""

imagecreator/backend/app/models/history.py

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+"""History model placeholder."""

imagecreator/backend/app/models/user.py

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+"""User model placeholder."""

imagecreator/backend/app/schemas/__init__.py

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+"""Schemas module."""

imagecreator/backend/app/schemas/auth.py

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+"""Auth schemas placeholder."""

imagecreator/backend/app/schemas/history.py

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+"""History schemas placeholder."""

imagecreator/backend/app/schemas/image.py

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+"""Image schemas placeholder."""

imagecreator/backend/app/schemas/user.py

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+"""User schemas placeholder."""

imagecreator/backend/app/services/__init__.py

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+"""Services module."""

imagecreator/backend/app/services/auth.py

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+"""Auth service placeholder."""

imagecreator/backend/app/services/image.py

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+"""Image service placeholder."""

imagecreator/backend/app/services/llm.py

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+"""LLM service placeholder."""

imagecreator/backend/requirements.txt

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+fastapi==0.109.0
+uvicorn[standard]==0.27.0
+sqlalchemy==2.0.25
+psycopg2-binary==2.9.9
+python-jose[cryptography]==3.3.0
+passlib[bcrypt]==1.7.4
+python-multipart==0.0.6
+pydantic==2.5.3
+pydantic-settings==2.1.0
+google-genai==0.8.0
+openai==1.12.0
+aiofiles==23.2.1
+httpx==0.26.0
+pytest==8.0.0
+pytest-asyncio==0.23.4