refactor(monkeyd): port the crawler in-tree and drop the submodule

The monkeyd-crawler repository moved into tiennm99/mttools, so recursive
clones of the old submodule URL fail and block every deploy. The crawler,
PDF renderer, and export flow now live under internal/modules/monkeyd,
trimmed to the bot's use: a fixed phone page, the bundled font only, and
the font size as the single export option.

.github/workflows/ci.yml

@@ -16,12 +16,7 @@ jobs:
       matrix:
         go: ['1.26.5']
     steps:
-      # The monkeyd module builds against third_party/monkeyd-crawler, which is
-      # a submodule wired in through a go.mod replace directive. Without it
-      # checked out, every Go step fails to resolve the package.
       - uses: actions/checkout@v6
-        with:
-          submodules: true
 
       - uses: actions/setup-go@v6
         with: