refactor(api): standardize DTOs and update swagger

Decouple API contract from internal models by introducing dedicated DTOs for requests and responses.
- Add Response DTOs for all resources (API Keys, Bindings, Models, Namespaces, etc.)
- Update Swagger annotations to use DTOs with field examples instead of internal models
- Refactor handlers to bind and return DTO structures
- Consolidate request/response definitions in the dto package

internal/api/log_webhook_handler.go

@@ -3,17 +3,24 @@ package api
 import (
 	"net/http"
 
+	"github.com/ez-api/ez-api/internal/dto"
 	"github.com/ez-api/ez-api/internal/service"
 	"github.com/gin-gonic/gin"
 )
 
+// Ensure dto types are referenced for swagger generation
+var (
+	_ dto.LogWebhookConfigResponse
+	_ dto.UpdateLogWebhookConfigRequest
+)
+
 // GetLogWebhookConfig godoc
 // @Summary      Get log webhook config
 // @Description  Returns current webhook notification config
 // @Tags         admin
 // @Produce      json
 // @Security     AdminAuth
-// @Success      200  {object}  ResponseEnvelope{data=service.LogWebhookConfig}
+// @Success      200  {object}  ResponseEnvelope{data=dto.LogWebhookConfigResponse}
 // @Failure      500  {object}  ResponseEnvelope{data=MapData}
 // @Router       /admin/logs/webhook [get]
 func (h *Handler) GetLogWebhookConfig(c *gin.Context) {
@@ -36,8 +43,8 @@ func (h *Handler) GetLogWebhookConfig(c *gin.Context) {
 // @Accept       json
 // @Produce      json
 // @Security     AdminAuth
-// @Param        request  body      service.LogWebhookConfig  true  "Webhook config"
-// @Success      200      {object}  ResponseEnvelope{data=service.LogWebhookConfig}
+// @Param        request  body      dto.UpdateLogWebhookConfigRequest  true  "Webhook config"
+// @Success      200      {object}  ResponseEnvelope{data=dto.LogWebhookConfigResponse}
 // @Failure      400      {object}  ResponseEnvelope{data=MapData}
 // @Failure      500      {object}  ResponseEnvelope{data=MapData}
 // @Router       /admin/logs/webhook [put]