Chechnya Caught In Unending Limbo Of War and Peace
Military violence remains part of daily routine of Grozny, Chechnya, months after Russia declared conclusion of the military phase of 'counterterrorist' operation; city is caught between a war that Russians cannot end and a peace that cannot take hold until a new Chechen leadership emerges to tame or supplant the warlords and 'bandits' whom Moscow is determined to crush; 150,000 people who have returned to live in Grozny complain that they live in repressive conditions of undeclared martial law, subjected to random searches, arrests, extortion and intimidation at more than 100 checkpoints; about 7,000 Russian troops are stationed in city, choking movement of people and basic foodstuffs; photo (M)