AI网关新增TTS/重排/审核端点,xAI工具扩展,swagger修缺

- 新端点 /ai/v1/audio/speech(xai.grok-tts)、/rerank(cohere.rerank-v4)、/moderations(OCI Guardrails)
- Responses 放行 code_interpreter 与远程 mcp 工具,web_search/x_search 解除仅非流式限制
- 模型能力映射扩展:TEXT_RERANK→RERANK、TEXT_TO_AUDIO→TTS
- AI 网关文档独立 docs/ai-gateway.md,字段兼容矩阵只列支持项;README 精简引用
- swagger 修缺:135 处响应注解具体化,RawMessage/联合类型统一渲染 AnyJSON,overrides 迁至 docs/.swaggo
- CHANGELOG 0.4.0,版本段不再记日期;DASH_VERSION v0.4.0

internal/api/subscription.go

@@ -4,12 +4,14 @@ import (
 	"net/http"
 
 	"github.com/gin-gonic/gin"
+
+	_ "oci-portal/internal/oci" // swagger 注解引用
 )
 
 // @Summary  订阅列表
 // @Tags     租户配置
 // @Param    id path int true "配置 ID"
-// @Success  200 {object} map[string]any
+// @Success  200 {array} oci.SubscriptionInfo
 // @Security BearerAuth
 // @Router   /api/v1/oci-configs/{id}/subscriptions [get]
 func (h *ociConfigHandler) subscriptions(c *gin.Context) {
@@ -29,7 +31,7 @@ func (h *ociConfigHandler) subscriptions(c *gin.Context) {
 // @Tags     租户配置
 // @Param    id path int true "配置 ID"
 // @Param    subscriptionId path string true "subscriptionId"
-// @Success  200 {object} map[string]any
+// @Success  200 {object} oci.SubscriptionDetail
 // @Security BearerAuth
 // @Router   /api/v1/oci-configs/{id}/subscriptions/{subscriptionId} [get]
 func (h *ociConfigHandler) subscriptionDetail(c *gin.Context) {
@@ -48,7 +50,7 @@ func (h *ociConfigHandler) subscriptionDetail(c *gin.Context) {
 // @Summary  限额服务列表
 // @Tags     租户配置
 // @Param    id path int true "配置 ID"
-// @Success  200 {object} map[string]any
+// @Success  200 {array} oci.LimitService
 // @Security BearerAuth
 // @Router   /api/v1/oci-configs/{id}/limits/services [get]
 func (h *ociConfigHandler) limitServices(c *gin.Context) {