feat: add dingtalk-feishu-collector SOP skill

Reusable 6-step pipeline for collecting DingTalk group messages,
extracting Feishu doc links, fetching content, and generating summaries.

Skills structure:
- SKILL.md: trigger rules, workflow, config reference
- config.yaml: group IDs, collection settings
- scripts/paths.py: shared path resolution
- scripts/step1-6: modular pipeline steps
- scripts/run_all.py: one-click runner

output/reports/latest_summary.md

@@ -0,0 +1,20 @@
+# 钉钉群聊飞书文档采集报告
+> 生成: 2026-06-06 11:12
+
+## 数据总览
+
+| 指标 | 数量 |
+|------|------|
+| 消息 | 7 |
+| 文档 | 139 |
+| 附件 | 21 |
+
+### dc
+- 消息: 5 (2026-06-06 00:11:33 ~ 2026-06-06 09:36:25)
+- 文档: 19
+- 附件: 20
+
+### cx
+- 消息: 2 (2026-06-06 00:35:41 ~ 2026-06-06 01:48:34)
+- 文档: 7
+- 附件: 1

output/reports/summary_20260606.md

@@ -0,0 +1,20 @@
+# 钉钉群聊飞书文档采集报告
+> 生成: 2026-06-06 11:12
+
+## 数据总览
+
+| 指标 | 数量 |
+|------|------|
+| 消息 | 7 |
+| 文档 | 139 |
+| 附件 | 21 |
+
+### dc
+- 消息: 5 (2026-06-06 00:11:33 ~ 2026-06-06 09:36:25)
+- 文档: 19
+- 附件: 20
+
+### cx
+- 消息: 2 (2026-06-06 00:35:41 ~ 2026-06-06 01:48:34)
+- 文档: 7
+- 附件: 1