refactor(openflare): unify protocol API responses to Wavelet format

Migrate Agent/Relay/Tunnel handlers from compat {success,message,data}
to response.OK and response.Abort* with real HTTP status codes. Remove
the compat package and update openflare-agent, openflare-relay, and
openflared clients to parse {error_msg,data}.

Wavelet/internal/apps/openflare/agent/middleware.go

@@ -6,7 +6,7 @@ package agent
 import (
 	"strings"
 
-	"github.com/Rain-kl/Wavelet/internal/apps/openflare/compat"
+	"github.com/Rain-kl/Wavelet/internal/common/response"
 	"github.com/Rain-kl/Wavelet/internal/model"
 	"github.com/gin-gonic/gin"
 )
@@ -22,8 +22,7 @@ func AgentAuth() gin.HandlerFunc {
 		token := strings.TrimSpace(c.GetHeader(agentTokenHeader))
 		node, err := AuthenticateAccessToken(c.Request.Context(), token)
 		if err != nil {
-			compat.Unauthorized(c, errInvalidAgentToken)
-			c.Abort()
+			response.AbortUnauthorized(c, errInvalidAgentToken)
 			return
 		}
 		c.Set(agentNodeContextKey, node)
@@ -41,8 +40,7 @@ func AgentRegisterAuth() gin.HandlerFunc {
 			return
 		}
 		if err := ValidateDiscoveryToken(c.Request.Context(), token); err != nil {
-			compat.Unauthorized(c, errInvalidDiscoveryToken)
-			c.Abort()
+			response.AbortUnauthorized(c, errInvalidDiscoveryToken)
 			return
 		}
 		c.Set("discovery_enabled", true)
@@ -58,4 +56,4 @@ func AgentNodeFromContext(c *gin.Context) (*model.OpenFlareNode, bool) {
 	}
 	node, ok := value.(*model.OpenFlareNode)
 	return node, ok
-}
+}