开源准备：重写 README 展示 UI/UX，更新模块路径

- 新增界面截图与 CONTRIBUTING.md
- README 以三栏布局、暗色主题、移动端等视觉亮点为主
- go module 迁移至 git.iioio.com/freefire/jiang13-forum

Co-authored-by: Cursor <cursoragent@cursor.com>

service/auth.go

@@ -5,7 +5,7 @@ import (
 	"time"
 
 	"github.com/golang-jwt/jwt/v5"
-	"github.com/jiang13/forum/model"
+	"git.iioio.com/freefire/jiang13-forum/model"
 )
 
 const TokenExpire = 7 * 24 * time.Hour

service/board.go

@@ -3,7 +3,7 @@ package service
 import (
 	"errors"
 
-	"github.com/jiang13/forum/model"
+	"git.iioio.com/freefire/jiang13-forum/model"
 )
 
 type BoardService struct{}

service/comment.go

@@ -6,7 +6,7 @@ import (
 	"net/url"
 	"strings"
 
-	"github.com/jiang13/forum/model"
+	"git.iioio.com/freefire/jiang13-forum/model"
 )
 
 type CommentService struct {

service/online.go

@@ -4,7 +4,7 @@ import (
 	"sync"
 	"time"
 
-	"github.com/jiang13/forum/model"
+	"git.iioio.com/freefire/jiang13-forum/model"
 )
 
 const onlineTTL = 5 * time.Minute

service/post.go

@@ -4,7 +4,7 @@ import (
 	"errors"
 	"strings"
 
-	"github.com/jiang13/forum/model"
+	"git.iioio.com/freefire/jiang13-forum/model"
 	"gorm.io/gorm"
 )
 

service/user.go

@@ -10,7 +10,7 @@ import (
 	"strings"
 	"time"
 
-	"github.com/jiang13/forum/model"
+	"git.iioio.com/freefire/jiang13-forum/model"
 )
 
 type UserService struct {