feat: 添加媒体播放功能，支持基于短时效token的播放入口及相关API接口

backend/docs/swagger.json

@@ -2334,6 +2334,37 @@
                 }
             }
         },
+        "/t/{tenantCode}/v1/media/play": {
+            "get": {
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "TenantMedia"
+                ],
+                "summary": "媒体播放入口（短时效 token）",
+                "parameters": [
+                    {
+                        "type": "string",
+                        "description": "Tenant Code",
+                        "name": "tenantCode",
+                        "in": "path",
+                        "required": true
+                    },
+                    {
+                        "type": "string",
+                        "description": "Play token",
+                        "name": "token",
+                        "in": "query",
+                        "required": true
+                    }
+                ],
+                "responses": {}
+            }
+        },
         "/t/{tenantCode}/v1/orders": {
             "get": {
                 "consumes": [
@@ -3229,10 +3260,10 @@
             "type": "object",
             "properties": {
                 "assets": {
-                    "description": "Assets is the list of media assets for the requested role (preview/main).",
+                    "description": "Assets is the list of playable assets for the requested role (preview/main).",
                     "type": "array",
                     "items": {
-                        "$ref": "#/definitions/models.MediaAsset"
+                        "$ref": "#/definitions/dto.ContentPlayableAsset"
                     }
                 },
                 "content": {
@@ -3324,6 +3355,32 @@
                 }
             }
         },
+        "dto.ContentPlayableAsset": {
+            "type": "object",
+            "properties": {
+                "asset_id": {
+                    "type": "integer"
+                },
+                "expires_at": {
+                    "description": "ExpiresAt indicates when PlayURL/token expires; optional.",
+                    "type": "string"
+                },
+                "meta": {
+                    "description": "Meta is a display-safe whitelist (currently passthrough JSON); optional.",
+                    "type": "array",
+                    "items": {
+                        "type": "integer"
+                    }
+                },
+                "play_url": {
+                    "description": "PlayURL is a short-lived URL; do NOT expose bucket/object_key directly.",
+                    "type": "string"
+                },
+                "type": {
+                    "$ref": "#/definitions/consts.MediaAssetType"
+                }
+            }
+        },
         "dto.ContentPriceUpsertForm": {
             "type": "object",
             "properties": {