调整项目结构,factory只负责暴露方法，不实现业务细节

docs/middleware.md

@@ -136,7 +136,7 @@ import (
     "net/http"
     "git.toowon.com/jimmy/go-common/middleware"
     commonhttp "git.toowon.com/jimmy/go-common/http"
-    "git.toowon.com/jimmy/go-common/datetime"
+    "git.toowon.com/jimmy/go-common/tools"
 )
 
 func handler(w http.ResponseWriter, r *http.Request) {
@@ -146,12 +146,12 @@ func handler(w http.ResponseWriter, r *http.Request) {
     timezone := h.GetTimezone()
     
     // 使用时区
-    now := datetime.Now(timezone)
-    datetime.FormatDateTime(now, timezone)
+    now := tools.Now(timezone)
+    tools.FormatDateTime(now, timezone)
     
     h.Success(map[string]interface{}{
         "timezone": timezone,
-        "time": datetime.FormatDateTime(now),
+        "time": tools.FormatDateTime(now),
     })
 }
 
@@ -168,7 +168,7 @@ func main() {
 import (
     "net/http"
     "git.toowon.com/jimmy/go-common/middleware"
-    "git.toowon.com/jimmy/go-common/datetime"
+    "git.toowon.com/jimmy/go-common/tools"
 )
 
 func handler(w http.ResponseWriter, r *http.Request) {
@@ -177,7 +177,7 @@ func handler(w http.ResponseWriter, r *http.Request) {
 
 func main() {
     // 使用自定义默认时区
-    handler := middleware.TimezoneWithDefault(datetime.UTC)(http.HandlerFunc(handler))
+    handler := middleware.TimezoneWithDefault(tools.UTC)(http.HandlerFunc(handler))
     http.Handle("/api", handler)
     http.ListenAndServe(":8080", nil)
 }
@@ -185,11 +185,43 @@ func main() {
 
 #### 在业务代码中使用时区
 
+**推荐方式：通过 factory 使用（黑盒模式）**
+
+```go
+import (
+    "net/http"
+    "git.toowon.com/jimmy/go-common/factory"
+)
+
+func GetUserList(w http.ResponseWriter, r *http.Request) {
+    fac, _ := factory.NewFactoryFromFile("config.json")
+    
+    // 从请求中获取时区
+    timezone := fac.GetTimezone(r)
+    
+    // 使用时区进行时间处理
+    now := fac.Now(timezone)
+    
+    // 查询数据时使用时区
+    startTime := fac.StartOfDay(now, timezone)
+    endTime := fac.EndOfDay(now, timezone)
+    
+    // 返回数据
+    fac.Success(w, map[string]interface{}{
+        "timezone": timezone,
+        "startTime": fac.FormatDateTime(startTime),
+        "endTime": fac.FormatDateTime(endTime),
+    })
+}
+```
+
+**或者直接使用 tools 包：**
+
 ```go
 import (
     "net/http"
     commonhttp "git.toowon.com/jimmy/go-common/http"
-    "git.toowon.com/jimmy/go-common/datetime"
+    "git.toowon.com/jimmy/go-common/tools"
 )
 
 func GetUserList(w http.ResponseWriter, r *http.Request) {
@@ -199,17 +231,17 @@ func GetUserList(w http.ResponseWriter, r *http.Request) {
     timezone := h.GetTimezone()
     
     // 使用时区进行时间处理
-    now := datetime.Now(timezone)
+    now := tools.Now(timezone)
     
     // 查询数据时使用时区
-    startTime := datetime.StartOfDay(now, timezone)
-    endTime := datetime.EndOfDay(now, timezone)
+    startTime := tools.StartOfDay(now, timezone)
+    endTime := tools.EndOfDay(now, timezone)
     
     // 返回数据
     h.Success(map[string]interface{}{
         "timezone": timezone,
-        "startTime": datetime.FormatDateTime(startTime),
-        "endTime": datetime.FormatDateTime(endTime),
+        "startTime": tools.FormatDateTime(startTime),
+        "endTime": tools.FormatDateTime(endTime),
     })
 }
 ```
@@ -658,7 +690,7 @@ import (
     "git.toowon.com/jimmy/go-common/middleware"
     "git.toowon.com/jimmy/go-common/logger"
     commonhttp "git.toowon.com/jimmy/go-common/http"
-    "git.toowon.com/jimmy/go-common/datetime"
+    "git.toowon.com/jimmy/go-common/tools"
 )
 
 func apiHandler(w http.ResponseWriter, r *http.Request) {
@@ -666,12 +698,12 @@ func apiHandler(w http.ResponseWriter, r *http.Request) {
     
     // 从Handler获取时区
     timezone := h.GetTimezone()
-    now := datetime.Now(timezone)
+    now := tools.Now(timezone)
     
     h.Success(map[string]interface{}{
         "message": "Hello",
         "timezone": timezone,
-        "time": datetime.FormatDateTime(now),
+        "time": tools.FormatDateTime(now),
     })
 }
 
@@ -756,7 +788,7 @@ import (
     
     "git.toowon.com/jimmy/go-common/middleware"
     commonhttp "git.toowon.com/jimmy/go-common/http"
-    "git.toowon.com/jimmy/go-common/datetime"
+    "git.toowon.com/jimmy/go-common/tools"
 )
 
 func apiHandler(w http.ResponseWriter, r *http.Request) {
@@ -764,12 +796,12 @@ func apiHandler(w http.ResponseWriter, r *http.Request) {
     
     // 从Handler获取时区
     timezone := h.GetTimezone()
-    now := datetime.Now(timezone)
+    now := tools.Now(timezone)
     
     h.Success(map[string]interface{}{
         "message": "Hello",
         "timezone": timezone,
-        "time": datetime.FormatDateTime(now),
+        "time": tools.FormatDateTime(now),
     })
 }