Add Dockerfile and .dockerignore; refactor import paths in app modules

services/device_manager/app/app.py

@@ -1,12 +1,12 @@
 import datetime
 import logging
 
-from db_models import Device, DeviceCertificate  # SQLAlchemy ORM models
 from fastapi import FastAPI, HTTPException
 
-from cert_manager import CertificateManager
-from database import get_db_context
-from models import DeviceRegistrationRequest, DeviceRegistrationResponse, DeviceResponse
+from app.cert_manager import CertificateManager
+from app.database import get_db_context
+from app.db_models import Device, DeviceCertificate  # SQLAlchemy ORM models
+from app.models import DeviceRegistrationRequest, DeviceRegistrationResponse, DeviceResponse
 
 logger = logging.getLogger(__name__)
 

services/device_manager/app/cert_manager.py

@@ -7,8 +7,8 @@ from cryptography.hazmat.primitives.asymmetric import rsa
 from cryptography.x509.oid import NameOID
 from nanoid import generate
 
-from config import config
-from models import DeviceRegistrationResponse
+from app.config import config
+from app.models import DeviceRegistrationResponse
 
 lowercase_numbers = "abcdefghijklmnopqrstuvwxyz0123456789"
 

services/device_manager/app/database.py

@@ -9,7 +9,7 @@ from contextlib import contextmanager
 from sqlalchemy import create_engine
 from sqlalchemy.orm import Session, sessionmaker
 
-from config import config
+from app.config import config
 
 # Create engine with connection pooling
 engine = create_engine(

services/device_manager/app/models.py

@@ -2,6 +2,7 @@ import datetime
 
 from pydantic import BaseModel
 
+
 class DeviceRegistrationRequest(BaseModel):
     """Request model for registering a new device."""