chore(skills): sync .gemini and .github skills and fix i18n validator

.github/skills/doc-mirror-sync/SKILL.md

@@ -0,0 +1,14 @@
+---
+name: doc-mirror-sync
+description: Automatically synchronizes plugin READMEs to the official documentation directory (docs/). Use after editing a plugin's local documentation to keep the MkDocs site up to date.
+---
+
+# Doc Mirror Sync
+
+## Overview
+Automates the mirroring of `plugins/{type}/{name}/README.md` to `docs/plugins/{type}/{name}.md`.
+
+## Workflow
+1. Identify changed READMEs.
+2. Copy content to corresponding mirror paths.
+3. Update version badges in `docs/plugins/{type}/index.md`.

.github/skills/doc-mirror-sync/scripts/sync.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python3
+import os
+import shutil
+import re
+
+def sync_mirrors():
+    plugins_root = "plugins"
+    docs_root = "docs/plugins"
+    
+    types = ["actions", "filters", "pipes", "pipelines", "tools"]
+    
+    for t in types:
+        src_type_dir = os.path.join(plugins_root, t)
+        dest_type_dir = os.path.join(docs_root, t)
+        
+        if not os.path.exists(src_type_dir): continue
+        os.makedirs(dest_type_dir, exist_ok=True)
+        
+        for name in os.listdir(src_type_dir):
+            plugin_dir = os.path.join(src_type_dir, name)
+            if not os.path.isdir(plugin_dir): continue
+            
+            # Sync README.md -> docs/plugins/{type}/{name}.md
+            src_readme = os.path.join(plugin_dir, "README.md")
+            if os.path.exists(src_readme):
+                dest_readme = os.path.join(dest_type_dir, f"{name}.md")
+                shutil.copy(src_readme, dest_readme)
+                print(f"✅ Mirrored: {t}/{name} (EN)")
+            
+            # Sync README_CN.md -> docs/plugins/{type}/{name}.zh.md
+            src_readme_cn = os.path.join(plugin_dir, "README_CN.md")
+            if os.path.exists(src_readme_cn):
+                dest_readme_zh = os.path.join(dest_type_dir, f"{name}.zh.md")
+                shutil.copy(src_readme_cn, dest_readme_zh)
+                print(f"✅ Mirrored: {t}/{name} (ZH)")
+
+if __name__ == "__main__":
+    sync_mirrors()