Add per-project socket limit and Revit socket device-type flag

- Project setting maxSocketsPerCircuit (migration 0018,
  project.update-settings schema 4, snapshot schema 11); older command
  and snapshot versions keep or upgrade the value to null.
- Revit configuration schema 2 marks device types as socket; version 1
  stays readable and derives the flag from socketCount family rules.
- Settings dialog field and device-type card on the Revit page.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/project-command.service.test.ts

@@ -1081,6 +1081,7 @@ describe("project command service", () => {
           workStage: null,
           projectLead: null,
           projectEditor: null,
+          maxSocketsPerCircuit: null,
         }),
       });
       assert.equal(updated.history.currentRevision, 1);