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>

platform/config/bootstrap_env.py

@@ -1,90 +0,0 @@
-"""Load optional env files before the rest of the app reads ``os.environ``.
-
-Only ``_local/system.env`` (next to the committed template ``_local/system.env.example``) is read.
-Variables already set in the process environment are never overwritten (shell/export wins).
-
-新增进程环境变量时：必须在 ``_local/system.env.example`` 用中文登记说明（见该文件顶部的仓库约定）。
-"""
-
-from __future__ import annotations
-
-import os
-from pathlib import Path
-
-_LOADED = False
-
-
-def _project_root() -> Path:
-    return Path(__file__).resolve().parents[2]
-
-
-def _parse_env_file(path: Path) -> dict[str, str | None]:
-    out: dict[str, str | None] = {}
-    try:
-        text = path.read_text(encoding="utf-8", errors="replace")
-    except OSError:
-        return out
-    for line in text.splitlines():
-        s = line.strip()
-        if not s or s.startswith("#"):
-            continue
-        if s.startswith("export "):
-            s = s[7:].strip()
-        if "=" not in s:
-            continue
-        k, _, rest = s.partition("=")
-        key = k.strip()
-        if not key:
-            continue
-        val = rest.strip()
-        if len(val) >= 2 and val[0] == val[-1] and val[0] in "\"'":
-            val = val[1:-1]
-        out[key] = val
-    return out
-
-
-def load_system_env(*, force: bool = False) -> list[str]:
-    """Merge env files into ``os.environ`` for keys not already set.
-
-    Returns the list of existing files that contributed (merged order).
-    """
-    global _LOADED
-    if _LOADED and not force:
-        return []
-
-    root = _project_root()
-    candidates = [root / "_local" / "system.env"]
-
-    merged: dict[str, str | None] = {}
-    dotenv_values = None
-    try:
-        from dotenv import dotenv_values as _dv  # type: ignore
-
-        dotenv_values = _dv
-    except ImportError:
-        pass
-
-    loaded_paths: list[str] = []
-    for p in candidates:
-        if not p.is_file():
-            continue
-        loaded_paths.append(str(p.resolve()))
-        if dotenv_values is not None:
-            vals = dotenv_values(p)
-            for k, v in vals.items():
-                merged[str(k)] = v
-        else:
-            merged.update(_parse_env_file(p))
-
-    for key, val in merged.items():
-        if not key or key in os.environ:
-            continue
-        if val is None:
-            continue
-        os.environ[str(key)] = str(val)
-
-    _LOADED = True
-    return loaded_paths
-
-
-__all__ = ["load_system_env"]