feat(mcp): application read tools

[andypalmi]

Summary

Phase 1 read-only MCP tools for the application resource, added to forge/ee/lib/mcp/tools/applications.js:

• platform_list_application_snapshots - GET /applications/:applicationId/snapshots
• platform_export_application_audit_log - GET /applications/:applicationId/audit-log/export
• platform_list_team_application_statuses - GET /teams/:teamId/applications/status

Each tool describes the application resource, so all three are filed with the existing application tools, following the one-file-per-resource convention. platform_export_application_audit_log is the CSV export counterpart of the already-shipped platform_get_application_audit_log. platform_list_team_application_statuses returns the applications in a team with the live status of their instances and devices.

All tools are annotated readOnlyHint: true, destructiveHint: false.

Backing scopes are already present in the user:expert-mcp allow-list (forge/routes/auth/permissions.js): project:snapshot:list, application:audit-log, team:projects:list. No allow-list changes were needed.

Closes #7690

Test plan

• eslint on changed files passes with no errors
• CI

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.64%. Comparing base (103f9ae) to head (3a537c8).

Additional details and impacted files

@@                        Coverage Diff                        @@
##           feat/mcp-tools-shared-schemas    #7716      +/-   ##
=================================================================
+ Coverage                          75.41%   75.64%   +0.23%     
=================================================================
  Files                                426      426              
  Lines                              22551    22545       -6     
  Branches                            5949     5939      -10     
=================================================================
+ Hits                               17006    17054      +48     
+ Misses                              5545     5491      -54     

Flag	Coverage Δ
backend	75.64% <100.00%> (+0.23%)	⬆️

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