feat(project): sync engineering standards and finalize markdown-normalizer v1.2.7

- Update .github/copilot-instructions.md with latest i18n and naming standards
- Add docs/development/issue-reply-guide.md for professional community engagement
- Sync all documentation (MKDocs, READMEs, Docs) to v1.2.7
- Include CI/CD and Agent instruction templates for better automation

.agent/rules/antigravity.md

@@ -0,0 +1,147 @@
+---
+description: >
+  Antigravity development mode rules. Apply when the user requests high-speed iteration,
+  a quick prototype, or says "反重力开发" / "antigravity mode".
+globs: "plugins/**/*.py"
+always_on: false
+---
+# Antigravity Development Mode
+
+> High-speed delivery + strict reversibility. Every decision must keep both roll-forward and rollback feasible.
+
+---
+
+## Core Principles
+
+1. **Small, isolated edits** — one logical change per operation; no mixing refactor + feature.
+2. **Deterministic interfaces** — function signatures and return shapes must not change without an explicit contract update.
+3. **Multi-level fallback** — every I/O path has a degraded alternative (e.g., S3 → local → DB).
+4. **Reversible by default** — every file write, API call, or schema change must have an undo path recorded or be idempotent.
+
+---
+
+## Mandatory Safety Patterns
+
+### 1. Timeout Guards on All Frontend Calls
+
+Any `__event_call__` or `__event_emitter__` JS execution MUST be wrapped:
+
+```python
+import asyncio
+
+try:
+    result = await asyncio.wait_for(
+        __event_call__({"type": "execute", "data": {"code": js_code}}),
+        timeout=2.0
+    )
+except asyncio.TimeoutError:
+    logger.warning("Frontend JS execution timed out; falling back.")
+    result = fallback_value
+except Exception as e:
+    logger.error(f"Frontend call failed: {e}", exc_info=True)
+    result = fallback_value
+```
+
+JS side must also guard internally:
+
+```javascript
+try {
+    return (localStorage.getItem('locale') || navigator.language || 'en-US');
+} catch (e) {
+    return 'en-US';
+}
+```
+
+### 2. Path Sandbox Validation
+
+Resolve every workspace path and verify it stays inside the repo root:
+
+```python
+import os
+
+def _validate_workspace_path(path: str, workspace_root: str) -> str:
+    resolved = os.path.realpath(os.path.abspath(path))
+    root = os.path.realpath(workspace_root)
+    if not resolved.startswith(root + os.sep) and resolved != root:
+        raise PermissionError(f"Path escape detected: {resolved} is outside {root}")
+    return resolved
+```
+
+### 3. Dual-Channel Upload Fallback
+
+Always try API first; fall back to DB/local on failure:
+
+```python
+async def _upload_file(self, filename: str, content: bytes) -> str:
+    # Channel 1: API upload (S3-compatible)
+    try:
+        url = await self._api_upload(filename, content)
+        if url:
+            return url
+    except Exception as e:
+        logger.warning(f"API upload failed: {e}; falling back to local.")
+
+    # Channel 2: Local file + DB registration
+    return await self._local_db_upload(filename, content)
+```
+
+### 4. Progressive Status Reporting
+
+For tasks > 3 seconds, emit staged updates:
+
+```python
+await self._emit_status(emitter, "正在分析内容...", done=False)
+# ... phase 1 ...
+await self._emit_status(emitter, "正在生成输出...", done=False)
+# ... phase 2 ...
+await self._emit_status(emitter, "完成", done=True)
+```
+
+Always emit `done=True` on completion and `notification(error)` on failure.
+
+### 5. Emitter Guard
+
+Check before every emit to prevent crashes on missing emitter:
+
+```python
+if emitter and self.valves.SHOW_STATUS:
+    await emitter({"type": "status", "data": {"description": msg, "done": done}})
+```
+
+### 6. Exception Surface Rule
+
+Never swallow exceptions silently. Every `except` block must:
+
+- Log to backend: `logger.error(f"...: {e}", exc_info=True)`
+- Notify user: `await self._emit_notification(emitter, f"处理失败: {str(e)}", "error")`
+
+---
+
+## Edit Discipline
+
+| ✅ DO | ❌ DO NOT |
+|-------|-----------|
+| One function / one Valve / one method per edit | Mix multiple unrelated changes in one operation |
+| Validate input at the function boundary | Assume upstream data is well-formed |
+| Return early on invalid state | Nest complex logic beyond 3 levels |
+| Check fallback availability before primary path | Assume primary path always succeeds |
+| Log before and after expensive I/O | Skip logging for "obvious" operations |
+
+---
+
+## Rollback Checklist
+
+Before completing an antigravity operation, confirm:
+
+- [ ] No global state mutated on `self` (filter singleton rule)
+- [ ] File writes are atomic or can be recreated
+- [ ] Database changes are idempotent (safe to re-run)
+- [ ] Timeout guards are in place for all async calls to external systems
+- [ ] The user can observe progress through status/notification events
+
+---
+
+## References
+
+- Full engineering spec: `.github/copilot-instructions.md` → Section: **Antigravity Development Mode**
+- Design document: `docs/development/copilot-engineering-plan.md` → Section 5