feat: initial TrustOS platform scaffold

- FastAPI backend: auth, findings, dashboard, attack paths, footprint, AI translator, risk calculator, PDF report generator
- Next.js frontend: Vault dashboard, login, findings table, finding detail with AI coach, digital footprint, reports
- PostgreSQL data model: tenants, users, assets, findings, risk scores, audit reports, attack paths
- Docker Compose + Dockerfiles for all services
- Demo seed data: Acme Corp with 6 findings and 90-day risk score history
- AI Risk Translator (OpenAI/Anthropic) with plain-English business impact
- Role-based access: executive / it_admin / trustos_admin
- Scope-lock engine: authorization required before any assessment

Stage 1-8 complete: Phase 1 Vault Audit product ready

backend/app/core/security.py

@@ -0,0 +1,57 @@
+from datetime import datetime, timedelta
+from typing import Optional, Any
+from jose import JWTError, jwt
+from passlib.context import CryptContext
+from fastapi import HTTPException, status, Depends
+from fastapi.security import OAuth2PasswordBearer
+from app.core.config import settings
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl=f"{settings.API_V1_STR}/auth/login")
+
+
+def verify_password(plain: str, hashed: str) -> bool:
+    return pwd_context.verify(plain, hashed)
+
+
+def hash_password(password: str) -> str:
+    return pwd_context.hash(password)
+
+
+def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
+    to_encode = data.copy()
+    expire = datetime.utcnow() + (expires_delta or timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES))
+    to_encode.update({"exp": expire})
+    return jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)
+
+
+def decode_token(token: str) -> dict:
+    try:
+        return jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM])
+    except JWTError:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Could not validate credentials",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+
+
+async def get_current_user_payload(token: str = Depends(oauth2_scheme)) -> dict:
+    return decode_token(token)
+
+
+def require_roles(*roles: str):
+    """Dependency factory — require one of the specified roles."""
+    async def role_checker(payload: dict = Depends(get_current_user_payload)):
+        if payload.get("role") not in roles:
+            raise HTTPException(
+                status_code=status.HTTP_403_FORBIDDEN,
+                detail="Insufficient permissions"
+            )
+        return payload
+    return role_checker
+
+
+require_executive_or_above = require_roles("executive", "it_admin", "trustos_admin")
+require_it_or_above = require_roles("it_admin", "trustos_admin")
+require_admin = require_roles("trustos_admin")