feat(queue): 增加非文本模型分布式准入队列

使用 PostgreSQL 统一同步与异步非文本任务的并发准入、持久化等待和 Worker 容量分配，并将生产 API 与独立 Worker 角色拆分。

补充策略管理、共享契约、OpenAPI、Kubernetes 双节点 Worker 清单及跨节点验收脚本；未默认启用任何生产 queue_size 策略。

已在原基线完成 Go、前端、迁移、Shell、Kustomize 与长任务容量验收；合入最新主干后将重新执行发布门禁。

apps/api/internal/runner/admission_test.go

@@ -0,0 +1,21 @@
+package runner
+
+import "testing"
+
+func TestDistributedAdmissionModelTypeBoundary(t *testing.T) {
+	for _, modelType := range []string{
+		"image_generate", "image_edit", "image_analysis", "image_vectorize",
+		"video_generate", "video_enhance", "image_to_video", "text_to_video",
+		"video_edit", "video_reference", "video_first_last_frame", "video_understanding", "omni_video", "omni",
+		"audio_generate", "audio_understanding", "text_to_speech", "voice_clone",
+	} {
+		if !distributedAdmissionModelType(modelType) {
+			t.Errorf("%s should use distributed admission", modelType)
+		}
+	}
+	for _, modelType := range []string{"text_generate", "embedding", "rerank", "", "unknown"} {
+		if distributedAdmissionModelType(modelType) {
+			t.Errorf("%s should preserve immediate execution/rate-limit behavior", modelType)
+		}
+	}
+}