refactor: root-package imports (svc/runtime/interfaces) and fix PYTHONPATH

- Rename platform/ to svc/ to avoid shadowing stdlib platform.
- Replace from oclaw.* with from svc/runtime/interfaces; update -m CLI paths.
- tests/conftest: prepend repo root to sys.path (no parent-folder package name).
- CI: paths and offline_eval script under repo root.
- Ops scripts: PYTHONPATH must be repo root for python -m runtime.* (fixes gateway/WhatsApp sidecar startup).
- Fix default oclaw.json path in tabular/file attachment limits; stabilize attachment test config.

Co-authored-by: Cursor <cursoragent@cursor.com>

runtime/operations/stack.py

@@ -13,7 +13,7 @@ def cmd_stack_up(args: argparse.Namespace) -> int:
     gateway_cmd = default_python_command(
         [
             "-m",
-            "oclaw.runtime.operations",
+            "runtime.operations",
             "gateway",
             "start",
             "--host",
@@ -27,7 +27,7 @@ def cmd_stack_up(args: argparse.Namespace) -> int:
     channel_cmd = default_python_command(
         [
             "-m",
-            "oclaw.runtime.operations",
+            "runtime.operations",
             "channel",
             args.channel,
             "start",
@@ -51,7 +51,7 @@ def cmd_stack_up(args: argparse.Namespace) -> int:
     print("ok=1")
     for name, pid in started:
         print(f"{name}_pid={pid}")
-    print("hint=use `python -m oclaw.runtime.operations stack status` to check running services")
+    print("hint=use `python -m runtime.operations stack status` to check running services")
     return 0