feat(mcp): catalog read tools

[andypalmi]

Summary

Read tools for the platform catalogs, added to forge/ee/lib/mcp/tools/platform.js. Adds get-by-id lookups (the list variants already exist) and the team-type catalog reads:

• platform_get_template - GET /templates/:templateId
• platform_get_blueprint - GET /flow-blueprints/:flowBlueprintId
• platform_list_team_types - GET /team-types
• platform_get_team_type - GET /team-types/:teamTypeId

No stack or instance-type get-by-id tools: the existing platform_list_hosted_instance_types already returns every project-type nested with its full stacks and a defaultStack, and accepts a projectType argument to narrow to one type. GET /project-types/:id and GET /stacks/:id use the same views.ProjectType.projectType and views.ProjectStack.stack views that tool already returns, so platform_get_hosted_instance_type, platform_get_stack, and a standalone platform_list_stacks would be redundant and are not added.

Team types are a global platform catalog with no team in the path, mirroring project-types, so they are filed with the platform catalog tools following the one-file-per-resource convention. All tools are readOnlyHint: true, destructiveHint: false.

Scopes allow-listed for user:expert-mcp in forge/routes/auth/permissions.js:

• template:read
• flow-blueprint:read
• team-type:list
• team-type:read

Closes #7679

Test plan

• eslint on changed files passes
• CI

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.38%. Comparing base (a8f760b) to head (00e42a2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7721      +/-   ##
==========================================
+ Coverage   76.17%   76.38%   +0.20%     
==========================================
  Files         440      440              
  Lines       23604    23618      +14     
  Branches     6285     6285              
==========================================
+ Hits        17981    18040      +59     
+ Misses       5623     5578      -45     

Flag	Coverage Δ
backend	76.38% <100.00%> (+0.20%)	⬆️

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