fix(ci): initialize submodules in publish-main checkout

The publish-main job runs npm publish which triggers prepublishOnly →
build:lsp-tools-mcp. That script needs packages/lsp-tools-mcp/ populated,
but actions/checkout@v4 doesn't init submodules by default.

Without this, publish-main failed with 'npm error code 1' on an empty
packages/lsp-tools-mcp/ directory, blocking v4.2.0 release.

Aligns with ci.yml which already uses submodules: recursive everywhere.

.github/workflows/publish.yml

@@ -143,6 +143,7 @@ jobs:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
+          submodules: recursive
 
       - run: git fetch --force --tags