feat: kubectl-style CLI + Deployment/Pod model for servers/instances

Server = Deployment (defines what to run + desired replicas)
Instance = Pod (ephemeral, auto-created by reconciliation)

Backend:
- Add replicas field to McpServer schema
- Add reconcile() to InstanceService (scales instances to match replicas)
- Remove manual start/stop/restart - instances are auto-managed
- Cascade: deleting server stops all containers then cascades DB
- Server create/update auto-triggers reconciliation

CLI:
- Add top-level delete command (servers, instances, profiles, projects)
- Add top-level logs command
- Remove instance compound command (use get/delete/logs instead)
- Clean up project command (list/show/delete → top-level get/describe/delete)
- Enhance describe for instances with container inspect info
- Add replicas to apply command's ServerSpec

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/db/prisma/schema.prisma

@@ -60,6 +60,7 @@ model McpServer {
   externalUrl   String?
   command       Json?
   containerPort Int?
+  replicas      Int             @default(1)
   envTemplate   Json            @default("[]")
   version       Int             @default(1)
   createdAt     DateTime        @default(now())