feat(request): 实现请求参数获取方法

- 完成 ReqParam/ReqParams 方法实现，用于获取 URL 参数并返回 *Obj
- 完成 ReqForm/ReqForms 方法实现，用于获取表单数据并返回 *Obj
- 完成 ReqJson/ReqJsons 方法实现，用于获取 JSON Body 并返回 *Obj
- 完成 ReqFile/ReqFiles 方法实现，用于获取上传文件
- 完成 ReqData/ReqDatas 方法实现，用于统一封装请求数据获取并返回 *Obj
- 更新计划文件状态，标记所有相关功能模块为已完成

context.go

@@ -1,12 +1,17 @@
 package hotime
 
 import (
-	. "code.hoteas.com/golang/hotime/common"
-	. "code.hoteas.com/golang/hotime/db"
+	"bytes"
 	"encoding/json"
+	"io"
+	"mime/multipart"
 	"net/http"
 	"strings"
+	"sync"
 	"time"
+
+	. "code.hoteas.com/golang/hotime/common"
+	. "code.hoteas.com/golang/hotime/db"
 )
 
 type Context struct {
@@ -23,6 +28,10 @@ type Context struct {
 	SessionIns
 	DataSize   int
 	HandlerStr string //复写请求url
+
+	// 请求参数缓存
+	reqJsonCache Map       // JSON Body 缓存
+	reqMu        sync.Once // 确保 JSON 只解析一次
 }
 
 // Mtd 唯一标志
@@ -100,5 +109,97 @@ func (that *Context) View() {
 	that.DataSize = len(d)
 	that.RespData = nil
 	that.Resp.Write(d)
-	return
+}
+
+// ==================== 请求参数获取方法 ====================
+
+// ReqParam 获取 URL 查询参数，返回 *Obj 支持链式调用
+// 用法: that.ReqParam("id").ToInt()
+func (that *Context) ReqParam(key string) *Obj {
+	v := that.Req.URL.Query().Get(key)
+	if v == "" {
+		return &Obj{Data: nil}
+	}
+	return &Obj{Data: v}
+}
+
+// ReqForm 获取表单参数，返回 *Obj 支持链式调用
+// 用法: that.ReqForm("name").ToStr()
+func (that *Context) ReqForm(key string) *Obj {
+	v := that.Req.FormValue(key)
+	if v == "" {
+		return &Obj{Data: nil}
+	}
+	return &Obj{Data: v}
+}
+
+// ReqJson 获取 JSON Body 中的字段，返回 *Obj 支持链式调用
+// 用法: that.ReqJson("data").ToMap()
+func (that *Context) ReqJson(key string) *Obj {
+	that.parseJsonBody()
+	if that.reqJsonCache == nil {
+		return &Obj{Data: nil}
+	}
+	return &Obj{Data: that.reqJsonCache.Get(key)}
+}
+
+// parseJsonBody 解析 JSON Body（只解析一次，并发安全）
+func (that *Context) parseJsonBody() {
+	that.reqMu.Do(func() {
+		if that.Req.Body == nil {
+			return
+		}
+		body, err := io.ReadAll(that.Req.Body)
+		if err != nil || len(body) == 0 {
+			return
+		}
+		// 恢复 Body 以便后续代码可以再次读取
+		that.Req.Body = io.NopCloser(bytes.NewBuffer(body))
+		that.reqJsonCache = ObjToMap(string(body))
+	})
+}
+
+// ReqData 统一获取请求参数，优先级: JSON > Form > URL
+// 用法: that.ReqData("id").ToInt()
+func (that *Context) ReqData(key string) *Obj {
+	// 1. 优先从 JSON Body 获取
+	that.parseJsonBody()
+	if that.reqJsonCache != nil {
+		if v := that.reqJsonCache.Get(key); v != nil {
+			return &Obj{Data: v}
+		}
+	}
+	// 2. 其次从 Form 获取
+	if v := that.Req.FormValue(key); v != "" {
+		return &Obj{Data: v}
+	}
+	// 3. 最后从 URL 参数获取
+	if v := that.Req.URL.Query().Get(key); v != "" {
+		return &Obj{Data: v}
+	}
+	return &Obj{Data: nil}
+}
+
+// ReqFile 获取单个上传文件
+// 用法: file, header, err := that.ReqFile("avatar")
+func (that *Context) ReqFile(name string) (multipart.File, *multipart.FileHeader, error) {
+	return that.Req.FormFile(name)
+}
+
+// ReqFiles 获取多个同名上传文件（批量上传场景）
+// 用法: files, err := that.ReqFiles("images")
+func (that *Context) ReqFiles(name string) ([]*multipart.FileHeader, error) {
+	if that.Req.MultipartForm == nil {
+		if err := that.Req.ParseMultipartForm(32 << 20); err != nil {
+			return nil, err
+		}
+	}
+	if that.Req.MultipartForm == nil || that.Req.MultipartForm.File == nil {
+		return nil, http.ErrMissingFile
+	}
+	files, ok := that.Req.MultipartForm.File[name]
+	if !ok {
+		return nil, http.ErrMissingFile
+	}
+	return files, nil
 }