feat(routing): 引入多执行池智能调度

将 Worker 发现、路由画像、容量与执行传输抽象为平台无关接口，新增 Kubernetes 和静态容量适配器，并以 shadow 模式接入生产配置。

实现网络与容量评分、路由防抖、池队列、同步 Worker 租约、一次性执行令牌，以及提交状态不明时禁止重复分配的安全语义。

新增 0105 兼容迁移、管理接口、指标、OpenAPI 和回归测试。已执行全量 Go 测试、go vet、OpenAPI、迁移安全、Compose 与 Kustomize 验证。

apps/api/internal/runner/http_execution_transport_test.go

@@ -0,0 +1,53 @@
+package runner
+
+import (
+	"context"
+	"encoding/json"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/easyai/easyai-ai-gateway/apps/api/internal/executionpool"
+)
+
+func TestHTTPExecutionTransportUsesAdvertisedEndpointAndProtocol(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(response http.ResponseWriter, request *http.Request) {
+		if request.URL.Path != workerExecutionPath {
+			t.Fatalf("path=%q", request.URL.Path)
+		}
+		if got := request.Header.Get("Authorization"); got != "Worker signed-token" {
+			t.Fatalf("authorization=%q", got)
+		}
+		var payload InternalExecutionRequest
+		if err := json.NewDecoder(request.Body).Decode(&payload); err != nil {
+			t.Fatal(err)
+		}
+		if payload.TaskID != "task-1" || payload.LeaseID != "lease-1" || !payload.Stream {
+			t.Fatalf("payload=%+v", payload)
+		}
+		response.Header().Set("X-Worker", "accepted")
+		response.WriteHeader(http.StatusAccepted)
+		_, _ = response.Write([]byte("ok"))
+	}))
+	defer server.Close()
+
+	transport := httpExecutionTransport{client: server.Client()}
+	result, err := transport.Execute(context.Background(), executionpool.WorkerDescriptor{
+		WorkerID: "worker-1", PoolID: "pool-1", Endpoint: server.URL,
+	}, executionpool.ExecutionRequest{
+		TaskID: "task-1", PoolID: "pool-1", WorkerID: "worker-1", LeaseID: "lease-1",
+		AuthorizationToken: "signed-token", Stream: true,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer result.Body.Close()
+	body, err := io.ReadAll(result.Body)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if result.StatusCode != http.StatusAccepted || len(result.Headers["X-Worker"]) != 1 || result.Headers["X-Worker"][0] != "accepted" || string(body) != "ok" {
+		t.Fatalf("result=%+v body=%q", result, body)
+	}
+}