refactor: complete backend rewrite for multi-protocol proxy

Major rewrite of the Go backend to support:
- Three API format imports: openai, anthropic, compatible
- Three protocol conversions: Chat Completions, Responses, Messages
- Hub-and-spoke architecture with Chat as intermediate format

Deleted:
- opencat.go (old entry)
- store/, team/, pkg/team/, pkg/store/ (old data layer)
- internal/model/, internal/consts/ (old types)
- internal/service/team/, internal/controller/team/ (old handlers)
- llm/ (removed LLM client library, pure proxy mode)
- dist/, assets/ (old build artifacts)

Added:
- internal/store/ — 9 GORM models + multi-DB support
- internal/pkg/ — crypto (AES-GCM), apikey, jwt, ratelimit, resp, tokenizer
- internal/channel/ — channel selection, weighted LB, health checks
- internal/proxy/convert/ — 6 protocol conversion functions + SSE streaming
- internal/proxy/ — gateway with request dispatch and upstream selection
- internal/usage/ — async usage recorder with batch writes
- internal/api/ — management API (auth, users, keys, channels, models)
- Makefile for build/test/deploy

Fixed API to match frontend expectations:
- Login response wraps token in { data: { token } }
- GET /api/profile route added
- Profile response wraps user in { code, data }
- Role returned as number (10=admin, 1=user)

middleware/auth.go

@@ -1,55 +1,53 @@
 package middleware
 
 import (
-	"fmt"
 	"net/http"
 	"opencatd-open/internal/auth"
-	"opencatd-open/internal/consts"
-	"opencatd-open/internal/dto"
-	"opencatd-open/internal/model"
-	"opencatd-open/pkg/store"
+	"opencatd-open/internal/store"
+	"opencatd-open/internal/pkg/jwt"
 
 	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
 )
 
-func Auth(c *gin.Context) {
-	authToken := c.GetHeader("Authorization")
-	if authToken == "" {
-		dto.Fail(c, http.StatusUnauthorized, "未提供认证信息")
-		return
+func Auth(db *gorm.DB) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		authToken := c.GetHeader("Authorization")
+		if authToken == "" {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{
+				"code":  http.StatusUnauthorized,
+				"error": "未提供认证信息",
+			})
+			return
+		}
+		if len(authToken) > 7 {
+			authToken = authToken[7:]
+		}
+		claim, err := jwt.ValidateToken(authToken, auth.GetSecretKey())
+		if err != nil {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{
+				"code":  http.StatusUnauthorized,
+				"error": "无效的认证信息",
+			})
+			return
+		}
+		var user store.User
+		if err := db.First(&user, claim.UserID).Error; err != nil {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{
+				"code":  http.StatusUnauthorized,
+				"error": "无效的认证信息",
+			})
+			return
+		}
+		c.Set("user", &user)
+		c.Set("user_id", claim.UserID)
+		c.Set("user_role", user.Role)
+		c.Next()
 	}
-	authToken = authToken[7:]
-	claim, err := auth.ValidateToken(authToken, consts.SecretKey)
-	if err != nil {
-		c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{
-			"code":  http.StatusUnauthorized,
-			"error": "无效的认证信息",
-		})
-		return
-	}
-	var user model.User
-	if err := store.GetDB().Model(&model.User{ID: int64(claim.UserID)}).First(&user).Error; err != nil {
-		c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{
-			"code":  http.StatusUnauthorized,
-			"error": "无效的认证信息",
-		})
-		return
-	}
-	c.Set("user", &user)
-	c.Set("user_id", claim.UserID)
-	c.Set("user_role", user.Role)
-	c.Next()
 }
-func CheckRole(role consts.UserRole) func(c *gin.Context) {
-	fmt.Println("CheckRoleMiddleware")
+
+func CheckRole(role string) gin.HandlerFunc {
 	return func(c *gin.Context) {
-		userRole := c.GetInt("user_role") // 操作者
-		fmt.Println("userRole", userRole)
-		// if userRole < int(role) {
-		// 	dto.Fail(c, http.StatusForbidden, "permission denied")
-		// 	return
-		// }
-
 		c.Next()
 	}
 }