perf(storage): 拦截任务二进制并本地暂存结果

原因：任务标准结果中的 Base64、Data URI 和 Buffer 会进入 PostgreSQL JSON，导致 TOAST 与备份体积快速增长。

影响：新增统一 JSON 持久化关口；upload_none 将二进制原子写入本地结果目录，数据库仅保存带 SHA-256 的有界占位符；任务详情、同步响应、异步查询和兼容协议按需校验恢复。补充 24 小时清理、容量上限、历史小批量治理命令及管理端说明。

风险：本地结果超过 TTL、丢失或损坏时分别返回明确的 410/500；空间不足时返回 503 且不重试上游。未自动执行历史治理。

验证：三种真实图片模型同步/异步与幂等重放通过；Go vet/全量测试、前端 111 测试、lint/typecheck/build、OpenAPI、迁移安全、govulncheck、依赖审计、手工发布测试及 Linux amd64 构建通过。

apps/api/docs/swagger.json

@@ -4738,6 +4738,12 @@
                         "schema": {
                             "$ref": "#/definitions/httpapi.EasyAIGeneratedResponse"
                         }
+                    },
+                    "410": {
+                        "description": "Gone",
+                        "schema": {
+                            "$ref": "#/definitions/httpapi.EasyAIGeneratedResponse"
+                        }
                     }
                 }
             }
@@ -5645,6 +5651,12 @@
                         "schema": {
                             "$ref": "#/definitions/httpapi.VolcesErrorEnvelope"
                         }
+                    },
+                    "410": {
+                        "description": "Gone",
+                        "schema": {
+                            "$ref": "#/definitions/httpapi.VolcesErrorEnvelope"
+                        }
                     }
                 }
             },
@@ -6304,6 +6316,13 @@
                             "type": "object",
                             "additionalProperties": true
                         }
+                    },
+                    "410": {
+                        "description": "Gone",
+                        "schema": {
+                            "type": "object",
+                            "additionalProperties": true
+                        }
                     }
                 }
             }
@@ -6404,6 +6423,13 @@
                             "type": "object",
                             "additionalProperties": true
                         }
+                    },
+                    "410": {
+                        "description": "Gone",
+                        "schema": {
+                            "type": "object",
+                            "additionalProperties": true
+                        }
                     }
                 }
             },
@@ -7883,6 +7909,12 @@
                             "$ref": "#/definitions/httpapi.ErrorEnvelope"
                         }
                     },
+                    "410": {
+                        "description": "Gone",
+                        "schema": {
+                            "$ref": "#/definitions/httpapi.ErrorEnvelope"
+                        }
+                    },
                     "500": {
                         "description": "Internal Server Error",
                         "schema": {
@@ -8305,6 +8337,12 @@
                             "$ref": "#/definitions/httpapi.KelingCompatibleEnvelope"
                         }
                     },
+                    "410": {
+                        "description": "Gone",
+                        "schema": {
+                            "$ref": "#/definitions/httpapi.KelingCompatibleEnvelope"
+                        }
+                    },
                     "500": {
                         "description": "Internal Server Error",
                         "schema": {
@@ -8766,6 +8804,12 @@
                             "$ref": "#/definitions/httpapi.ErrorEnvelope"
                         }
                     },
+                    "410": {
+                        "description": "Gone",
+                        "schema": {
+                            "$ref": "#/definitions/httpapi.ErrorEnvelope"
+                        }
+                    },
                     "500": {
                         "description": "Internal Server Error",
                         "schema": {

apps/api/docs/swagger.yaml

@@ -6821,6 +6821,10 @@ paths:
           description: Not Found
           schema:
             $ref: '#/definitions/httpapi.EasyAIGeneratedResponse'
+        "410":
+          description: Gone
+          schema:
+            $ref: '#/definitions/httpapi.EasyAIGeneratedResponse'
       security:
       - BearerAuth: []
       summary: 查询 server-main EasyAIClient 兼容任务结果
@@ -7429,6 +7433,10 @@ paths:
           description: Not Found
           schema:
             $ref: '#/definitions/httpapi.VolcesErrorEnvelope'
+        "410":
+          description: Gone
+          schema:
+            $ref: '#/definitions/httpapi.VolcesErrorEnvelope'
       security:
       - BearerAuth: []
       summary: 查询火山内容生成任务
@@ -7829,6 +7837,11 @@ paths:
           schema:
             additionalProperties: true
             type: object
+        "410":
+          description: Gone
+          schema:
+            additionalProperties: true
+            type: object
       security:
       - BearerAuth: []
       summary: 查询可灵 V1 Omni 视频任务
@@ -7893,6 +7906,11 @@ paths:
           schema:
             additionalProperties: true
             type: object
+        "410":
+          description: Gone
+          schema:
+            additionalProperties: true
+            type: object
       security:
       - BearerAuth: []
       summary: 按 ID 查询可灵 API 2.0 任务
@@ -8852,6 +8870,10 @@ paths:
           description: Not Found
           schema:
             $ref: '#/definitions/httpapi.ErrorEnvelope'
+        "410":
+          description: Gone
+          schema:
+            $ref: '#/definitions/httpapi.ErrorEnvelope'
         "500":
           description: Internal Server Error
           schema:
@@ -9123,6 +9145,10 @@ paths:
           description: Not Found
           schema:
             $ref: '#/definitions/httpapi.KelingCompatibleEnvelope'
+        "410":
+          description: Gone
+          schema:
+            $ref: '#/definitions/httpapi.KelingCompatibleEnvelope'
         "500":
           description: Internal Server Error
           schema:
@@ -9421,6 +9447,10 @@ paths:
           description: Not Found
           schema:
             $ref: '#/definitions/httpapi.ErrorEnvelope'
+        "410":
+          description: Gone
+          schema:
+            $ref: '#/definitions/httpapi.ErrorEnvelope'
         "500":
           description: Internal Server Error
           schema: