docs: 更新 CHANGELOG 和 Dockerfile

CHANGELOG 记录 Unreleased 新功能：
- internal 指令
- limit_rate 中间件
- server_tokens 配置
- types 配置块

Dockerfile 更新版本信息路径。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

CHANGELOG.md

@@ -5,6 +5,15 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/),
 and this project adheres to [Semantic Versioning](https://semver.org/).
 
+## [Unreleased]
+
+### Added
+
+- internal 指令：防止外部直接访问特定 location，支持 X-Accel-Redirect 内部重定向
+- limit_rate 中间件：响应速率限制，支持令牌桶算法和大文件回退策略
+- server_tokens 配置：控制 Server 响应头是否显示版本号
+- types 配置块：自定义 MIME 类型映射，线程安全实现
+
 ## [0.2.1] - 2026-04-17
 
 ### Added

Dockerfile

@@ -28,12 +28,12 @@ ARG BUILD_PLATFORM=unknown
 COPY . .
 RUN CGO_ENABLED=0 GOOS=linux go build \
     -ldflags="-s -w \
-        -X 'rua.plus/lolly/internal/app.Version=${VERSION}' \
-        -X 'rua.plus/lolly/internal/app.GitCommit=${GIT_COMMIT}' \
-        -X 'rua.plus/lolly/internal/app.GitBranch=${GIT_BRANCH}' \
-        -X 'rua.plus/lolly/internal/app.BuildTime=${BUILD_TIME}' \
-        -X 'rua.plus/lolly/internal/app.GoVersion=${GO_VERSION}' \
-        -X 'rua.plus/lolly/internal/app.BuildPlatform=${BUILD_PLATFORM}'" \
+        -X 'rua.plus/lolly/internal/version.Version=${VERSION}' \
+        -X 'rua.plus/lolly/internal/version.GitCommit=${GIT_COMMIT}' \
+        -X 'rua.plus/lolly/internal/version.GitBranch=${GIT_BRANCH}' \
+        -X 'rua.plus/lolly/internal/version.BuildTime=${BUILD_TIME}' \
+        -X 'rua.plus/lolly/internal/version.GoVersion=${GO_VERSION}' \
+        -X 'rua.plus/lolly/internal/version.BuildPlatform=${BUILD_PLATFORM}'" \
     -gcflags="-l=4" \
     -asmflags="-l=4" \
     -trimpath \