feat: rename application route names to kebab-case

[cstns]

Closes #8092
Part of #8084

Summary

Renames all 16 application route names from PascalCase to kebab-case. This is the largest batch in the epic.

• Application -> application (23 refs)
• ApplicationInstances -> application-instances
• ApplicationDashboards -> application-dashboards
• ApplicationDevices -> application-devices
• ApplicationDeviceGroups -> application-device-groups
• ApplicationSnapshots -> application-snapshots
• ApplicationPipelines -> application-pipelines
• CreatePipeline -> application-pipeline-create
• EditPipeline -> application-pipeline-edit
• CreatePipelineStage -> application-pipeline-stage-create
• EditPipelineStage -> application-pipeline-stage-edit
• ApplicationDeviceGroupIndex -> application-device-group
• ApplicationDeviceGroupDevices -> application-device-group-devices
• ApplicationDeviceGroupSettings -> application-device-group-settings
• ApplicationDeviceGroupSettingsGeneral -> application-device-group-settings-general
• ApplicationDeviceGroupSettingsEnvironment -> application-device-group-settings-environment

Updates ~102 references across 45 files including route definitions, breadcrumbs, tab navigation, API response mappers, pipeline components, device group pages, global search, and the MCP routes test.

Component defineOptions({ name }) properties left as-is.

Test plan

• Application page loads with correct tab selected (instances or devices depending on team features)
• All application tabs navigate correctly (instances, dashboards, devices, device groups, snapshots, pipelines, settings, logs, activity, dependencies)
• Create/edit pipeline flow works
• Create/edit pipeline stage flow works
• Device group pages load and navigate (devices tab, settings tabs)
• Breadcrumbs on application, device group, and create instance pages work
• Application links from device pages, instance pages, audit log, BOM, and global search work
• npm run test:unit:frontend passes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.17%. Comparing base (78050e1) to head (fa3fbd7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8106   +/-   ##
=======================================
  Coverage   76.17%   76.17%           
=======================================
  Files         440      440           
  Lines       23604    23604           
  Branches     6285     6285           
=======================================
  Hits        17981    17981           
  Misses       5623     5623           

Flag	Coverage Δ
backend	76.17% <ø> (ø)

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[n-lark]

I shipped a couple fixes for test fixtures and mcp tools route name for Applications -> applications for platform_create_application.

• Application page loads with correct tab selected (instances or devices depending on team features)
• All application tabs navigate correctly (instances, dashboards, devices, device groups, snapshots, pipelines, settings, logs, activity, dependencies)
• Create/edit pipeline flow works
• Create/edit pipeline stage flow works
• Device group pages load and navigate (devices tab, settings tabs)
• Breadcrumbs on application, device group, and create instance pages work
• Application links from device pages, instance pages, audit log, BOM, and global search work
• npm run test:unit:frontend passes