feat(ops): add managed NE management and batch CLI collection

Introduce workbench operations for multi-vendor NE CRUD/connect-test and Netmiko batch collection with job lifecycle controls, log downloads, and paginated run filters.

Co-authored-by: Cursor <cursoragent@cursor.com>

netx_api/db.py

@@ -12,3 +12,11 @@ class Base(DeclarativeBase):
 
 engine = create_engine(settings.database_url, future=True, pool_pre_ping=True)
 SessionLocal = sessionmaker(bind=engine, autoflush=False, autocommit=False, expire_on_commit=False)
+
+
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()