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/capacitycontroller/adapter_factory.go

@@ -0,0 +1,40 @@
+package capacitycontroller
+
+import (
+	"errors"
+	"os"
+	"strings"
+
+	"github.com/easyai/easyai-ai-gateway/apps/api/internal/config"
+)
+
+func NewConfiguredAdapter(cfg config.Config) (OrchestratorAdapter, error) {
+	switch strings.ToLower(strings.TrimSpace(cfg.CapacityOrchestratorAdapter)) {
+	case "static":
+		pools, err := cfg.CapacityPools()
+		if err != nil {
+			return nil, err
+		}
+		initial := make(map[string]int, len(pools))
+		for _, pool := range pools {
+			initial[pool.ID] = pool.BootstrapReplicas
+		}
+		return NewStaticAdapter(initial), nil
+	case "", "kubernetes":
+		return NewKubernetesClient(KubernetesConfig{
+			Namespace: adapterEnv("AI_GATEWAY_CAPACITY_CONTROLLER_NAMESPACE", adapterEnv("POD_NAMESPACE", "easyai")),
+			APIServer: adapterEnv("AI_GATEWAY_CAPACITY_CONTROLLER_API_SERVER", "https://kubernetes.default.svc"),
+			TokenFile: adapterEnv("AI_GATEWAY_CAPACITY_CONTROLLER_TOKEN_FILE", "/var/run/secrets/kubernetes.io/serviceaccount/token"),
+			CAFile:    adapterEnv("AI_GATEWAY_CAPACITY_CONTROLLER_CA_FILE", "/var/run/secrets/kubernetes.io/serviceaccount/ca.crt"),
+		})
+	default:
+		return nil, errors.New("unsupported capacity orchestrator adapter")
+	}
+}
+
+func adapterEnv(name, fallback string) string {
+	if value := strings.TrimSpace(os.Getenv(name)); value != "" {
+		return value
+	}
+	return fallback
+}