perf(queue): 按策略动态扩缩异步 Worker

将 River 执行容量按平台模型与用户组的有效并发策略动态调整，并为长任务续租、并发租约原子抢占和限流退避补充保护。\n\n统一平台模型限流继承语义，兼容历史 platformLimits/modelLimits，并为三个迁移图像模型建立独立并发租约。补充管理端显式继承/覆盖配置、指标、单元测试及隔离 PostgreSQL 验收。\n\n验证：go test ./... -count=1；pnpm lint；pnpm test；pnpm build；隔离 PostgreSQL 并发原子性/续租测试；128 任务与三分钟长任务动态 Worker 验收。

apps/api/docs/swagger.json

@@ -12848,6 +12848,13 @@
                     "type": "object",
                     "additionalProperties": {}
                 },
+                "rateLimitPolicyMode": {
+                    "type": "string",
+                    "enum": [
+                        "inherit",
+                        "override"
+                    ]
+                },
                 "retryPolicy": {
                     "type": "object",
                     "additionalProperties": {}
@@ -13838,6 +13845,13 @@
                     "type": "object",
                     "additionalProperties": {}
                 },
+                "rateLimitPolicyMode": {
+                    "type": "string",
+                    "enum": [
+                        "inherit",
+                        "override"
+                    ]
+                },
                 "retryPolicy": {
                     "type": "object",
                     "additionalProperties": {}

apps/api/docs/swagger.yaml

@@ -2439,6 +2439,11 @@ definitions:
       rateLimitPolicy:
         additionalProperties: {}
         type: object
+      rateLimitPolicyMode:
+        enum:
+        - inherit
+        - override
+        type: string
       retryPolicy:
         additionalProperties: {}
         type: object
@@ -3108,6 +3113,11 @@ definitions:
       rateLimitPolicy:
         additionalProperties: {}
         type: object
+      rateLimitPolicyMode:
+        enum:
+        - inherit
+        - override
+        type: string
       retryPolicy:
         additionalProperties: {}
         type: object