fix: resolve CHANGELOG.md path issue for Docker deployment

- Update changelog.go to use binary directory as base path
  - Uses os.Executable() instead of relative path '..'
  - Automatically adapts to local and Docker environments

- Modify server Dockerfile build context
  - Change context from ./server to project root (.)
  - Update COPY commands for new context
  - Add CHANGELOG.md to container image

- Update AGENTS.md guidelines
  - Explicitly specify relative path format for file references

This ensures the changelog API works correctly in both local development
and Docker deployment environments.

AGENTS.md

@@ -120,4 +120,4 @@ Upload: ZIP/XLSX → Extract → Convert UTF-8 CSV → Detect bill type → Dedu
 - **Dependencies:** Check `package.json`/`go.mod`/`requirements.txt` before adding new packages
 - **Tests:** Always run relevant test suite before committing changes
 - **Git commits:** Provide clear messages explaining the "why" of changes
-- **File references:** Use `file_path:line_number` format when mentioning code locations
+- **File references:** Use relative `file_path:line_number` format (e.g., `server/handler/changelog.go:12`) when mentioning code locations

docker-compose.yaml

@@ -27,8 +27,8 @@ services:
   # Go 后端服务
   server:
     build:
-      context: ./server
-      dockerfile: Dockerfile
+      context: .
+      dockerfile: server/Dockerfile
     container_name: billai-server
     restart: unless-stopped
     ports:

server/Dockerfile

@@ -1,5 +1,6 @@
 # Go 服务 Dockerfile
 # 多阶段构建：编译阶段 + 运行阶段
+# 构建上下文：项目根目录（docker-compose context: .）
 
 # ===== 编译阶段 =====
 FROM golang:1.24-alpine AS builder
@@ -10,11 +11,11 @@ WORKDIR /build
 ENV GOPROXY=https://goproxy.cn,direct
 
 # 先复制依赖文件，利用 Docker 缓存
-COPY go.mod go.sum ./
+COPY server/go.mod server/go.sum ./
 RUN go mod download
 
 # 复制源代码并编译
-COPY . .
+COPY server/ .
 RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o billai-server .
 
 # ===== 运行阶段 =====
@@ -35,6 +36,9 @@ ENV TZ=Asia/Shanghai
 COPY --from=builder /build/billai-server .
 COPY --from=builder /build/config.yaml .
 
+# 复制项目根目录的 CHANGELOG.md
+COPY CHANGELOG.md .
+
 # 创建必要目录
 RUN mkdir -p uploads outputs
 

server/service/changelog.go

@@ -20,8 +20,11 @@ func ParseChangelog() ([]ChangelogEntry, error) {
 	// 获取项目根目录
 	rootDir := os.Getenv("PROJECT_ROOT")
 	if rootDir == "" {
-		// 如果未设置，使用相对路径推测
-		rootDir = ".."
+		// 使用二进制文件所在目录作为基准
+		execPath, err := os.Executable()
+		if err == nil {
+			rootDir = filepath.Dir(execPath)
+		}
 	}
 
 	changelogPath := filepath.Join(rootDir, "CHANGELOG.md")