fix: replace 33 missing NLS keys causing blank wizard options

[qfai]

Summary

Fix 33 missing NLS key references that cause blank/empty labels in VS Code QuickPick menus.

Problem

After the JSON-driven wizard migration (#15560), many core.* NLS keys were deleted from fx-core/resource/package.nls.json and replaced with template.* keys in templates/src/ui/resource/package.nls.json. However, the old TypeScript code paths (used by VS platform, CLI, and Add Action flow) still reference the deleted core.* keys, causing getLocalizedString() to return empty strings.

Most notably, the Add Action → MCP option appears as a blank clickable item because core.createProjectQuestion.mcpForDa.label doesn't exist (#15629 introduced this).

Fix

• Replaced 29 core.* key references with their template.* equivalents
• Added 4 genuinely missing keys to fx-core/resource/package.nls.json

Affected Files

File	Keys Fixed
constants.ts	MCP label/detail, RAG source options (6)
CapabilityOptions.ts	CEA, Teams agent, RAG source labels (18)
teamsProjectTypeNode.ts	RAG label/placeholder (2)
create.ts	RAG placeholder (1)
package.nls.json	Added 4 missing keys

Verification

• TypeScript compilation passes
• NLS key scanner reports 0 missing keys (was 33)

bug