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/dto/log_webhook.go

@@ -0,0 +1,25 @@
+package dto
+
+// LogWebhookConfigResponse represents the log webhook configuration in API responses.
+// @Description Log webhook configuration response
+type LogWebhookConfigResponse struct {
+	Enabled             bool   `json:"enabled" example:"true"`
+	URL                 string `json:"url" example:"https://webhook.example.com/alerts"`
+	Secret              string `json:"secret" example:"webhook-secret-key"`
+	Threshold           int    `json:"threshold" example:"10"`
+	WindowSeconds       int    `json:"window_seconds" example:"60"`
+	CooldownSeconds     int    `json:"cooldown_seconds" example:"300"`
+	StatusCodeThreshold int    `json:"status_code_threshold" example:"500"`
+}
+
+// UpdateLogWebhookConfigRequest defines the request body for updating log webhook config.
+// @Description Update log webhook configuration request
+type UpdateLogWebhookConfigRequest struct {
+	Enabled             bool   `json:"enabled" example:"true"`
+	URL                 string `json:"url" example:"https://webhook.example.com/alerts"`
+	Secret              string `json:"secret" example:"webhook-secret-key"`
+	Threshold           int    `json:"threshold" example:"10"`
+	WindowSeconds       int    `json:"window_seconds" example:"60"`
+	CooldownSeconds     int    `json:"cooldown_seconds" example:"300"`
+	StatusCodeThreshold int    `json:"status_code_threshold" example:"500"`
+}