feat: add example plugins (ai_image, calendar, music, rss, weather), fix .gitignore, move gengskill to tools/

example/calendar/README.md

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+# calendar
+
+calendar plugin
+
+## Build
+
+```bash
+plugindev build
+```
+
+## Install
+
+Upload the .hmap file through the Plugin Manager API.

example/calendar/go.mod

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+module calendar
+
+go 1.25.0
+
+require gitcode.com/JianFeeeee/homeagent-sdk v0.0.0
+
+replace gitcode.com/JianFeeeee/homeagent-sdk => /tmp/opencode/sdk-clone

example/calendar/plg.json

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+{
+  "name": "calendar",
+  "name_zh": "日历",
+  "name_en": "Calendar",
+  "version": "1.0.0",
+  "description": "日历事件管理，支持提醒和重复事件",
+  "author": "HomeAgent",
+  "entry": "plugin.so",
+  "tags": ["calendar", "event", "reminder", "schedule"],
+  "targets": "linux/amd64"
+}