docs: add CONTRIBUTING guidelines

docs/CONTRIBUTING.md

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+# Contributing (OCM)
+
+This repo is optimized for fast iteration and safe maintenance.
+
+## Workflow (PM + Codex)
+
+- Codex implements changes on a **new branch** and opens a **PR**.
+- Xiao Qiang (PM) reviews + runs local smoke tests.
+- Tao approves.
+- Only after explicit approval, we merge.
+
+## Versioning
+
+- Single source of truth:
+  - `package.json#version`
+  - `openclaw-manager.js` → `APP_VERSION`
+- When bumping a version, update **both** in the same commit.
+- Prefer **semver-ish**: `MAJOR.MINOR.PATCH` (e.g. `0.8.2`).
+
+## Language policy (Docs + UI)
+
+- **DEVLOG.md must be English-only.**
+- UI:
+  - English mode should not show Chinese strings (except user-provided content).
+  - Chinese mode can be fully Chinese.
+- When adding new UI strings, ensure both locales are updated.
+
+## README policy
+
+- Keep the README homepage **short**.
+- Screenshots should be grouped (e.g. in a collapsible gallery) to avoid long scroll.
+- The “Features” section should be **complete** and reflect actual UI capabilities.
+
+## Screenshots (redaction)
+
+- Store public screenshots under: `docs/redacted-screenshots/`
+- Redact sensitive info:
+  - local username/path fragments
+  - Telegram peer IDs
+  - any tokens/keys
+- Prefer **English UI** screenshots.
+- Prefer clean crops (avoid arrows/annotations unless truly necessary).
+
+## Text style
+
+- Be concrete and user-focused.
+- Prefer consistent naming:
+  - “Remote backup setup” (not “NAS backup setup”)
+  - “Backups / Rollback” for restore/snapshot functionality
+
+## PR checklist
+
+- [ ] Description includes: what/why/how
+- [ ] If UI changed: include screenshots
+- [ ] Version updated when needed
+- [ ] English UI audited (no stray Chinese)
+- [ ] `DEVLOG.md` updated (English-only)