feat: add dashboard handlers for roles, sessions, skill definitions, tags, tickets, users, and WeChat integration

- Implement role management endpoints including listing, creating, updating, and deleting roles.
- Add session management endpoints for viewing and revoking sessions.
- Create skill definition management endpoints for CRUD operations and status updates.
- Introduce tag management endpoints for handling tags with sorting and status updates.
- Develop ticket management endpoints for viewing, creating, updating, and managing ticket progress.
- Implement user management endpoints for CRUD operations, role assignments, and password resets.
- Add WeChat callback handlers for verifying and processing messages.

internal/handlers/api/customer_handler.go

@@ -0,0 +1,29 @@
+package api
+
+import (
+	"cs-agent/internal/pkg/httpx"
+	"cs-agent/internal/pkg/openidentity"
+	"cs-agent/internal/services"
+
+	"github.com/gin-gonic/gin"
+	"github.com/mlogclub/simple/web"
+)
+
+func CustomerPostSession_exchange(ctx *gin.Context) {
+	channel := services.ChannelService.GetEnabledChannel(ctx)
+	if channel == nil {
+		httpx.WriteJSON(ctx, web.JsonErrorMsg("接入渠道不存在或已停用"))
+		return
+	}
+	externalUser, err := openidentity.GetExternalUser(ctx, services.ChannelService.GetUserTokenSecret(channel))
+	if err != nil {
+		httpx.WriteJSON(ctx, err)
+		return
+	}
+	resp, err := services.CustomerSessionService.Exchange(channel, *externalUser)
+	if err != nil {
+		httpx.WriteJSON(ctx, err)
+		return
+	}
+	httpx.WriteJSON(ctx, resp)
+}