ci: rename .github/workflows -> .gitea/workflows (post-suspension sweep)

GitHub org Molecule-AI was suspended 2026-05-06; SCM moved to Gitea
(git.moleculesai.app). The wholesale `git push --mirror` migration left
workflow files under .github/workflows/, which Gitea Actions does NOT
read - it reads .gitea/workflows/ exclusively.

This rename + the cross-repo `uses:` path rewrite are the minimum
edits to make CI fire on this repo again. The workflow content itself
is not modified (other than the path rewrites and lowercasing of the
old `Molecule-AI` org reference to the post-suspension `molecule-ai`).

Refs: feedback_post_suspension_migration_must_sweep_dormant_repos

.gitea/workflows/ci.yml

@@ -2,7 +2,7 @@ name: CI
 on: [push, pull_request]
 jobs:
   validate:
-    uses: molecule-ai/molecule-ci/.github/workflows/validate-workspace-template.yml@main
+    uses: molecule-ai/molecule-ci/.gitea/workflows/validate-workspace-template.yml@main
 
   tests:
     name: Adapter unit tests

.gitea/workflows/publish-image.yml

@@ -60,7 +60,7 @@ jobs:
 
   publish:
     needs: resolve-version
-    uses: molecule-ai/molecule-ci/.github/workflows/publish-template-image.yml@main
+    uses: molecule-ai/molecule-ci/.gitea/workflows/publish-template-image.yml@main
     secrets: inherit
     with:
       # Resolution chain (highest priority first):

.gitea/workflows/secret-scan.yml

@@ -15,7 +15,7 @@ name: Secret scan
 #
 #   jobs:
 #     secret-scan:
-#       uses: Molecule-AI/molecule-core/.github/workflows/secret-scan.yml@staging
+#       uses: molecule-ai/molecule-core/.gitea/workflows/secret-scan.yml@staging
 #
 # Pin to @staging not @main — staging is the active default branch,
 # main lags via the staging-promotion workflow. Updates ride along