feat(skills): add 6 generalized AI-driven development skills

- version-bumper: automated multi-file version synchronization
- plugin-scaffolder: standardized 12-language i18n template generation
- doc-mirror-sync: automated README to docs mirroring
- i18n-validator: dictionary key alignment analysis via AST
- gh-issue-replier: professional English reply with star-check logic
- gh-issue-scheduler: unanswered issue audit and action planning

.gemini/skills/community-announcer/SKILL.md

@@ -0,0 +1,23 @@
+---
+name: community-announcer
+description: Drafts engaging English and Chinese update announcements for the OpenWebUI Community and other social platforms. Use when a new version is released.
+---
+
+# Community Announcer
+
+## Overview
+Automates the drafting of high-impact update announcements.
+
+## Workflow
+1. **Source Intel**: Read the latest version's `What's New` section from `README.md`.
+2. **Drafting**: Create two versions:
+   - **Community Post**: Professional, structured, technical.
+   - **Catchy Short**: For Discord/Twitter, use emojis and bullet points.
+3. **Multi-language**: Generate BOTH English and Chinese versions automatically.
+
+## Announcement Structure (Recommended)
+- **Headline**: "Update vX.X.X - [Main Feature]"
+- **Introduction**: Brief context.
+- **Key Highlights**: Bulleted list of fixes/features.
+- **Action**: "Download from [Market Link]"
+- **Closing**: Thanks and Star request.