Retire the legacy Machine model (ADR-001 cutover)

The asset/computer model is now the single source of truth. Remove the Machine
instance layer end to end:

- Delete models Machine, MachineStatus, PCType, MachineRelationship,
  InstalledApp, PrinterData; keep MachineType (models.machinetypeid still
  references it).
- Delete the /api/machines, /api/statuses, /api/pctypes blueprints and the
  legacy /api/printers/legacy (PrinterData) blueprint.
- Drop the deprecated communications.machineid column and its FK.
- Migration 7c01 drops tables machines, machinestatuses, pctypes,
  machinerelationships, installedapps, printerdata (idempotent).
- Fix remaining readers (applications install counts) to ComputerInstalledApp.
- Frontend: remove dead machinesApi/statusesApi/pctypesApi wrappers; repoint
  the PC Types settings page at computer types.

143 tests pass; all asset/computer/dashboard/report/collector endpoints 200.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/api/index.js

@@ -58,38 +58,6 @@ export const authApi = {
   }
 }
 
-// Machines API (legacy - use equipmentApi or computersApi instead)
-export const machinesApi = {
-  list(params = {}) {
-    return api.get('/machines', { params })
-  },
-  get(id) {
-    return api.get(`/machines/${id}`)
-  },
-  create(data) {
-    return api.post('/machines', data)
-  },
-  update(id, data) {
-    return api.put(`/machines/${id}`, data)
-  },
-  delete(id) {
-    return api.delete(`/machines/${id}`)
-  },
-  updateCommunication(id, data) {
-    return api.put(`/machines/${id}/communication`, data)
-  },
-  // Relationships
-  getRelationships(id) {
-    return api.get(`/machines/${id}/relationships`)
-  },
-  createRelationship(id, data) {
-    return api.post(`/machines/${id}/relationships`, data)
-  },
-  deleteRelationship(relationshipId) {
-    return api.delete(`/machines/relationships/${relationshipId}`)
-  }
-}
-
 // Equipment API (plugin)
 export const equipmentApi = {
   list(params = {}) {
@@ -199,25 +167,6 @@ export const machinetypesApi = {
   }
 }
 
-// Statuses API
-export const statusesApi = {
-  list(params = {}) {
-    return api.get('/statuses', { params })
-  },
-  get(id) {
-    return api.get(`/statuses/${id}`)
-  },
-  create(data) {
-    return api.post('/statuses', data)
-  },
-  update(id, data) {
-    return api.put(`/statuses/${id}`, data)
-  },
-  delete(id) {
-    return api.delete(`/statuses/${id}`)
-  }
-}
-
 // Vendors API
 export const vendorsApi = {
   list(params = {}) {
@@ -396,25 +345,6 @@ export const modelsApi = {
   }
 }
 
-// PC Types API
-export const pctypesApi = {
-  list(params = {}) {
-    return api.get('/pctypes', { params })
-  },
-  get(id) {
-    return api.get(`/pctypes/${id}`)
-  },
-  create(data) {
-    return api.post('/pctypes', data)
-  },
-  update(id, data) {
-    return api.put(`/pctypes/${id}`, data)
-  },
-  delete(id) {
-    return api.delete(`/pctypes/${id}`)
-  }
-}
-
 // Operating Systems API
 export const operatingsystemsApi = {
   list(params = {}) {