feat: unify runtime logging (rotating files, log root, scripts, desktop)

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

desktop/README.md

@@ -27,9 +27,12 @@ The app will:
 2. Start backend using `python -m runtime.operations gateway start --host 127.0.0.1 --port <port>`.
 3. Open `http://127.0.0.1:<port>/chat` in the desktop window.
 
-Logs are written under:
+Logs (embedded backend, desktop shell, optional WeCom channel child) are written under the **runtime log root** (same as `AIA_RUNTIME_LOG_DIR` / `data/logs/` — see repo root [`docs/LOGGING.md`](../docs/LOGGING.md)). When launched via `runtime/operations/scripts/start_desktop.ps1`, `OCLAW_DESKTOP_LOG_ROOT` is set for you.
 
-- `%APPDATA%/oclaw/logs/backend.log` (Windows)
+Typical files:
+
+- `desktop.log`
+- `backend.log`
 
 ## Environment knobs
 

desktop/main.js

@@ -23,8 +23,16 @@ const APP_ICON_PATH = (() => {
   }
   return candidates[candidates.length - 1];
 })();
+const REPO_ROOT_FOR_LOGS = path.resolve(__dirname, "..");
+function resolveFileLogRoot() {
+  const fromEnv = String(
+    process.env.OCLAW_DESKTOP_LOG_ROOT || process.env.AIA_RUNTIME_LOG_DIR || ""
+  ).trim();
+  if (fromEnv) return path.resolve(fromEnv);
+  return path.join(REPO_ROOT_FOR_LOGS, "data", "logs");
+}
 const DATA_ROOT = path.join(app.getPath("userData"), "runtime-data");
-const LOG_ROOT = path.join(app.getPath("userData"), "logs");
+const LOG_ROOT = resolveFileLogRoot();
 const BACKEND_LOG_FILE = path.join(LOG_ROOT, "backend.log");
 const STARTUP_TIMEOUT_MS = 30000;
 const POLL_INTERVAL_MS = 600;