feat(pull): reply to and resolve review comments (#220)

Adds `reply_comment`, `resolve_thread` and `unresolve_thread` to `pull_request_review_write`, using the endpoints from https://github.com/go-gitea/gitea/pull/36683 and https://github.com/go-gitea/gitea/pull/36441 (SDK v1.2.0, no dependency change).

`review_id` is now optional for `pull_request_read` `get_review_comments`, so finding a comment to reply to takes one call instead of one per review. Review comments gained `review_id` and `resolved_by`.

Fixes https://gitea.com/gitea/gitea-mcp/issues/129

Verified against gitea.com (1.27.0+dev). Written by Claude (Opus 5).

Reviewed-on: https://gitea.com/gitea/gitea-mcp/pulls/220
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>

README.zh-cn.md

@@ -155,9 +155,9 @@ Cursor 等客户端可使用 stdio 命令：
 | issue_read                   | issue        | 读取 | 读取问题：详情、评论或标签                      |
 | issue_write                  | issue        | 写入 | 写入问题：创建、更新、管理评论和标签                 |
 | list_pull_requests           | pull_request | 读取 | 列出仓库拉取请求                           |
-| pull_request_read            | pull_request | 读取 | 读取拉取请求：详情、差异、变更文件、头部提交状态、审查        |
+| pull_request_read            | pull_request | 读取 | 读取拉取请求：详情、差异、变更文件、头部提交状态、审查、审查评论   |
 | pull_request_write           | pull_request | 写入 | 写入拉取请求：创建、更新、关闭、重新打开、合并、更新分支、管理审查者 |
-| pull_request_review_write    | pull_request | 写入 | 写入 PR 审查：创建、提交、删除、驳回               |
+| pull_request_review_write    | pull_request | 写入 | 写入 PR 审查：创建、提交、删除、驳回、回复和解决审查评论 |
 | actions_config_read          | actions      | 读取 | 读取 Actions 密钥和变量                   |
 | actions_config_write         | actions      | 写入 | 写入 Actions 密钥和变量：更新插入、创建、更新、删除     |
 | actions_run_read             | actions      | 读取 | 读取 Actions 工作流、运行、作业、日志和构件         |