[Phase 0] ci: add no-op smoke-test workflow to verify Act Runner

Adds .gitea/workflows/smoke-test.yaml as a manual workflow_dispatch trigger
that runs four echo commands.  When the Act Runner comes online (#77) the
operator can fire this from the Gitea Actions UI to confirm runner
registration and job dispatch work before any real tooling is needed.

Closes leeworks-agents/api-company#96

.gitea/workflows/smoke-test.yaml

@@ -0,0 +1,21 @@
+# Smoke test: confirms Gitea Act Runner is online and accepting jobs.
+# Run manually via workflow_dispatch after runner is registered (#77).
+# Closes leeworks-agents/api-company#96
+
+name: Runner Smoke Test
+
+on:
+  workflow_dispatch:
+
+jobs:
+  smoke:
+    name: Smoke Test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Confirm runner is online
+        run: |
+          echo "Runner is online!"
+          echo "Job ID: $GITHUB_JOB"
+          echo "Runner OS: $(uname -a)"
+          echo "Date: $(date -u)"
+          echo "Smoke test PASSED"