chore: add funding and Giscus comments support

- Add .github/FUNDING.yml for Ko-fi and GitHub Sponsors
- Add Ko-fi badge to README
- Configure Giscus with repo IDs for docs comments

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: ninyawee

.github/FUNDING.yml

@@ -0,0 +1,2 @@
+ko_fi: ninyawee
+github: ninyawee

README.md

@@ -67,6 +67,10 @@ mise run test:node     # Run Node tests
 2. Calculate weighted checksum: `sum(digit[i] * (13 - i))` for i in 0..12
 3. Verify: `(11 - sum % 11) % 10 == digit[12]`
 
+## Support
+
+[![Ko-fi](https://img.shields.io/badge/Ko--fi-Support%20me%20☕-ff5f5f?logo=ko-fi&logoColor=white)](https://ko-fi.com/ninyawee)
+
 ## License
 
 ISC

docs/overrides/main.html

@@ -8,9 +8,9 @@ <h2 id="__comments">{{ lang.t("meta.comments") }}</h2>
   <script
     src="https://giscus.app/client.js"
     data-repo="ninyawee/konjingjing"
-    data-repo-id="REPLACE_WITH_REPO_ID"
+    data-repo-id="MDEwOlJlcG9zaXRvcnkyODU5NzE1MDA"
     data-category="General"
-    data-category-id="REPLACE_WITH_CATEGORY_ID"
+    data-category-id="DIC_kwDOEQuULM4CzxM1"
     data-mapping="pathname"
     data-strict="0"
     data-reactions-enabled="1"