Add flask seed demo sample data; widen settings.description to TEXT

.github/workflows/ci.yml

@@ -92,6 +92,15 @@ jobs:
             flask plugin install "$p"
           done
           flask plugin upgrade-all
+      - name: Seed platform data (catches strict-mode data violations)
+        # Runs the real seeders on strict MySQL 8. A seeded row that exceeds a
+        # column width is a hard error 1406 here (not the silent truncation
+        # older/relaxed MySQL gives), so this is what catches over-length
+        # setting descriptions and similar before they reach a fresh box.
+        run: |
+          flask seed permissions
+          flask seed settings
+          flask seed reference-data
       - name: Assert schema built + utf8mb4
         run: |
           python - <<'PY'