Initial lightweight AI agent admin

backend/app/core/config.py

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+from functools import lru_cache
+from typing import Optional
+
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    app_name: str = "AI Agent Admin"
+    env: str = "dev"
+    debug: bool = False
+    app_host: str = "127.0.0.1"
+    app_port: int = 18083
+    database_url: str = "postgresql+asyncpg://ai_agent_admin:ai_agent_admin@127.0.0.1:5432/ai_agent_admin"
+    redis_url: Optional[str] = "redis://127.0.0.1:6379/3"
+    jwt_secret_key: str = "change-me-in-production"
+    jwt_algorithm: str = "HS256"
+    access_token_expire_minutes: int = 1440
+    cors_origins: str = "*"
+    seed_admin_email: str = "admin@ai-agent.local"
+    seed_admin_password: str = "admin123456"
+
+    model_config = SettingsConfigDict(env_file=".env", env_file_encoding="utf-8", extra="ignore")
+
+
+@lru_cache
+def get_settings() -> Settings:
+    return Settings()
+
+
+settings = get_settings()

backend/app/core/database.py

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+from collections.abc import AsyncGenerator
+
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+from sqlalchemy.orm import DeclarativeBase
+
+from app.core.config import settings
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+engine = create_async_engine(
+    settings.database_url,
+    echo=settings.debug,
+    pool_pre_ping=True,
+    pool_size=5,
+    max_overflow=10,
+)
+
+AsyncSessionLocal = async_sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
+
+
+async def get_db() -> AsyncGenerator[AsyncSession, None]:
+    async with AsyncSessionLocal() as session:
+        yield session

backend/app/core/security.py

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+from datetime import datetime, timedelta, timezone
+from typing import Any
+
+import bcrypt
+from jose import JWTError, jwt
+
+from app.core.config import settings
+
+
+def hash_password(password: str) -> str:
+    return bcrypt.hashpw(password.encode("utf-8"), bcrypt.gensalt()).decode("utf-8")
+
+
+def verify_password(password: str, password_hash: str) -> bool:
+    return bcrypt.checkpw(password.encode("utf-8"), password_hash.encode("utf-8"))
+
+
+def create_access_token(subject: str, extra: dict[str, Any] | None = None) -> str:
+    expires = datetime.now(timezone.utc) + timedelta(minutes=settings.access_token_expire_minutes)
+    payload: dict[str, Any] = {"sub": subject, "exp": expires}
+    if extra:
+        payload.update(extra)
+    return jwt.encode(payload, settings.jwt_secret_key, algorithm=settings.jwt_algorithm)
+
+
+def decode_access_token(token: str) -> dict[str, Any] | None:
+    try:
+        return jwt.decode(token, settings.jwt_secret_key, algorithms=[settings.jwt_algorithm])
+    except JWTError:
+        return None