Use McpbManifestDefault derived from DEFAULT_MANIFEST_VERSION

Changes:
- Create McpbManifestDefault type derived from VERSIONED_MANIFEST_SCHEMAS[DEFAULT_MANIFEST_VERSION]
- Update init.ts to use McpbManifestDefault instead of hardcoded v0.2 schema
- Import schema types from version matching DEFAULT_MANIFEST_VERSION (0.2)
- Update test to match commented-out localization field
- Make McpbManifest (deprecated) point to McpbManifestDefault

This makes the codebase more maintainable by deriving types from DEFAULT_MANIFEST_VERSION instead of hardcoding version references.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

test/init.test.ts

@@ -351,10 +351,6 @@ describe("init functions", () => {
           },
         ],
         screenshots: ["screen1.png", "screen2.png"],
-        localization: {
-          resources: "resources/${locale}.json",
-          default_locale: "en-US",
-        },
         server: {
           type: "python",
           entry_point: "server/main.py",