fix(scripts): clone-manifest.sh — use Gitea + lowercase org slug

Post-2026-05-06 GitHub-org suspension: scripts/clone-manifest.sh
was still pointing at https://github.com/${repo}.git, so the
Docker build for workspace-server'\''s platform image fails at:

  fatal: could not read Username for 'https://github.com':
         No such device or address

with no credentials available in the build container.

Fix: clone from https://git.moleculesai.app/${repo}.git instead.
manifest.json'\''s repo paths still read 'Molecule-AI/...' (the
historic GitHub slug, mixed-case); Gitea lowercases the org
component to 'molecule-ai/...'. Lowercase the org segment on
the fly with awk so we don'\''t need to rewrite every manifest
entry.

Local verify: bash -n passes, lowercase transform produces correct
Gitea paths, anonymous git clone of one of the manifest plugins
over HTTPS to git.moleculesai.app succeeds.

Class G in the prod-ship CI sweep — same shape as the github.com
ref Harness Replays hits, this is the second instance found.

scripts/clone-manifest.sh

@@ -45,11 +45,18 @@ clone_category() {
             continue
         fi
 
-        echo "  cloning $repo -> $target_dir/$name (ref=$ref)"
+        # Post-2026-05-06 GitHub-org-suspension: clone from Gitea instead.
+        # manifest.json paths still read "Molecule-AI/..." (the historic
+        # github.com slug); Gitea lowercases the org part to "molecule-ai/".
+        # Lowercase the org segment on the fly so we don't need to rewrite
+        # every manifest entry.
+        repo_gitea="$(echo "$repo" | awk -F/ '{ printf "%s", tolower($1); for (i=2; i<=NF; i++) printf "/%s", $i; print "" }')"
+
+        echo "  cloning $repo_gitea -> $target_dir/$name (ref=$ref)"
         if [ "$ref" = "main" ]; then
-            git clone --depth=1 -q "https://github.com/${repo}.git" "$target_dir/$name"
+            git clone --depth=1 -q "https://git.moleculesai.app/${repo_gitea}.git" "$target_dir/$name"
         else
-            git clone --depth=1 -q --branch "$ref" "https://github.com/${repo}.git" "$target_dir/$name"
+            git clone --depth=1 -q --branch "$ref" "https://git.moleculesai.app/${repo_gitea}.git" "$target_dir/$name"
         fi
         CLONED=$((CLONED + 1))
         i=$((i + 1))