feat(filters): refactor folder-rule-collector to folder-memory

- Rename plugin from `folder-rule-collector` to `folder-memory` for better clarity.
- Refactor code to focus on "Project Rules" collection, removing "Knowledge" collection for V1.
- Add `PRIORITY` valve (default: 20) to ensure execution after context compression.
- Update all parameter names to uppercase for consistency.
- Update documentation (README, global docs) with GitHub raw URL for demo image.
- Remove `STATUS` valve as it's redundant with OpenWebUI's built-in function toggle.
- Add `ROADMAP.md` to track future "Project Knowledge" features.
- Update `.github/copilot-instructions.md` with detailed commit message guidelines.

.github/copilot-instructions.md

@@ -822,6 +822,22 @@ Filter 实例是**单例 (Singleton)**。
 
 #### Commit Message 规范
 使用 Conventional Commits 格式 (`feat`, `fix`, `docs`, etc.)。
+**必须**在提交标题与正文中清晰描述变更内容，确保在 Release 页面可读且可追踪。
+
+要求：
+- 标题必须包含“做了什么”与影响范围（避免含糊词）。
+- 正文必须列出关键变更点（1-3 条），与实际改动一一对应。
+- 若影响用户或插件行为，必须在正文标明影响与迁移说明。
+
+推荐格式：
+- `feat(actions): add export settings panel`
+- `fix(filters): handle empty metadata to avoid crash`
+- `docs(plugins): update bilingual README structure`
+
+正文示例：
+- Add valves for export format selection
+- Update README/README_CN to include What's New section
+- Migration: default TITLE_SOURCE changed to chat_title
 
 ### 4. 🤖 Git Operations (Agent Rules)