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.go

@@ -0,0 +1,60 @@
+package runner
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"strings"
+
+	"github.com/easyai/easyai-ai-gateway/apps/api/internal/executionpool"
+)
+
+// httpExecutionTransport is the first platform-neutral Worker transport
+// adapter. The routing core sees only WorkerDescriptor and executionpool's
+// versioned request/response types; Pod DNS and other orchestrator concepts do
+// not cross this boundary.
+type httpExecutionTransport struct {
+	client *http.Client
+}
+
+func (transport httpExecutionTransport) Execute(
+	ctx context.Context,
+	worker executionpool.WorkerDescriptor,
+	input executionpool.ExecutionRequest,
+) (executionpool.ExecutionResponse, error) {
+	if transport.client == nil {
+		return executionpool.ExecutionResponse{}, errors.New("worker HTTP client is required")
+	}
+	payload, err := json.Marshal(InternalExecutionRequest{
+		TaskID:  input.TaskID,
+		LeaseID: input.LeaseID,
+		Stream:  input.Stream,
+	})
+	if err != nil {
+		return executionpool.ExecutionResponse{}, err
+	}
+	request, err := http.NewRequestWithContext(
+		ctx,
+		http.MethodPost,
+		strings.TrimRight(worker.Endpoint, "/")+workerExecutionPath,
+		bytes.NewReader(payload),
+	)
+	if err != nil {
+		return executionpool.ExecutionResponse{}, err
+	}
+	request.Header.Set("Content-Type", "application/json")
+	request.Header.Set("Authorization", "Worker "+input.AuthorizationToken)
+	response, err := transport.client.Do(request)
+	if err != nil {
+		return executionpool.ExecutionResponse{}, err
+	}
+	return executionpool.ExecutionResponse{
+		StatusCode: response.StatusCode,
+		Headers:    response.Header,
+		Body:       response.Body,
+	}, nil
+}
+
+var _ executionpool.ExecutionTransport = httpExecutionTransport{}