Add workflow template browser to Studio

[AbigailDeng]

Summary

• stack the read-only workflow template catalog API (b0dec8289) and curated built-in templates (33bee2c6a) as explicit dependency commits
• add a default-off, feature-flagged Workflow Studio template browser with search, category filters, exact-revision detail loading, expected I/O, requirements, compatibility, and parsed graph previews
• preserve member/workflow route identities and editable draft state while adding query-backed browser state, accessible focus handling, responsive layouts, and recoverable empty/error/incompatible states

Verification

• pnpm --dir apps/aevatar-console-web jest --runInBand --watchman=false --no-cache --runTestsByPath src/shared/config/consoleBuildConfig.test.ts src/shared/studio/api.test.ts src/pages/team-member-workflow-studio/index.test.tsx src/locales/hardcodedCopyAudit.test.ts: passed, 145/145 tests
• pnpm --dir apps/aevatar-console-web tsc: passed
• pnpm --dir apps/aevatar-console-web exec biome lint config/config.ts src/locales/en-US.ts src/locales/zh-CN.ts src/pages/team-member-workflow-studio/components/WorkflowStudioCanvas.tsx src/pages/team-member-workflow-studio/components/WorkflowStudioEmptyState.tsx src/pages/team-member-workflow-studio/components/WorkflowStudioTemplateBrowser.tsx src/pages/team-member-workflow-studio/hooks/useTeamMemberWorkflowStudio.ts src/pages/team-member-workflow-studio/index.test.tsx src/pages/team-member-workflow-studio/index.tsx src/shared/config/consoleBuildConfig.test.ts src/shared/config/consoleFeatures.ts src/shared/studio/api.test.ts src/shared/studio/api.ts src/shared/studio/models.ts: passed with one pre-existing warning
• pnpm --dir apps/aevatar-console-web build: passed
• bash tools/ci/test_stability_guards.sh: passed
• bash tools/docs/lint.sh: passed, 77 files and 0 errors
• bash tools/ci/query_projection_priming_guard.sh: passed
• env DOTNET_EnableWriteXorExecute=0 dotnet test test/Aevatar.Studio.Tests/Aevatar.Studio.Tests.csproj --nologo --no-restore --disable-build-servers -p:IsTestProject=true --verbosity minimal --filter 'FullyQualifiedName~BuiltInWorkflowTemplateCatalogTests|FullyQualifiedName~EmbeddedWorkflowTemplateCatalogQueryPortTests|FullyQualifiedName~WorkflowTemplateEndpointsTests|FullyQualifiedName~StudioInfrastructureServiceCollectionExtensionsTests': passed, 22/22 dependency tests

Risks

• bash tools/ci/architecture_guards.sh passed all checks available in this environment, then stopped because local buf is unavailable for proto lint
• repository-wide/full test suites were not run under the incremental unit-test policy

Closes #2969

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.45%. Comparing base (5426eff) to head (f953175).

@@            Coverage Diff             @@
##              dev    #2980      +/-   ##
==========================================
- Coverage   83.45%   83.45%   -0.01%     
==========================================
  Files        1376     1376              
  Lines      112732   112732              
  Branches    14366    14366              
==========================================
- Hits        94084    94079       -5     
- Misses      12096    12099       +3     
- Partials     6552     6554       +2     

Flag	Coverage Δ
ci	83.45% <ø> (-0.01%)	⬇️

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