链接迁移: 前端用户可见链接与 .github 元数据改指本仓 Gitea

- 前端: 侧边栏 REPO_URL 改指本仓 Gitea; 订阅设置帮助链接改指本仓
  Gitea 上的 docs/custom-subscription-templates.md (dist 产物未动, 下次构建自愈)
- FUNDING.yml: 删除上游作者的赞助句柄 (github/buy_me_a_coffee/custom 捐赠页),
  留注释说明; ISSUE_TEMPLATE: Wiki/搜索/最新版三个 contact_links 与
  question.yaml 的 Wiki 链接改指本仓 Gitea (仓库首页/Issues/Releases)
- .github/claude/repo-context.md: 安装命令一行改指本仓 install-master.sh

.github/ISSUE_TEMPLATE/question.yaml

@@ -9,7 +9,7 @@ body:
       value: |
         Before opening a question, please:
 
-        - Read the [project Wiki](https://github.com/MHSanaei/3x-ui/wiki) —
+        - Read the [project home](https://git.881218.xyz/rogue/3x-ui-agent) —
           most setup, install, and "how do I …" answers live there.
         - Search [existing issues](../issues?q=is%3Aissue) — the question
           may already have been asked.
@@ -85,7 +85,7 @@ body:
     attributes:
       label: Before submitting
       options:
-        - label: I read the [Wiki](https://github.com/MHSanaei/3x-ui/wiki) and searched [existing issues](../issues?q=is%3Aissue).
+        - label: I read the [project home](https://git.881218.xyz/rogue/3x-ui-agent) and searched [existing issues](../issues?q=is%3Aissue).
           required: true
         - label: This is a usage question, not a bug report.
           required: true