feat: add claw backend adapter

src/lib/execution/backend-selector.ts

@@ -3,11 +3,17 @@ import {
   ALIYUN_QWEN_BACKEND,
   isReadyAliyunQwenBackend,
 } from "@/lib/execution/backends/aliyun-qwen-backend";
+import {
+  CLAW_BACKEND,
+  type ClawBackendSelectionState,
+  isClawRequestKindSupported,
+} from "@/lib/execution/backends/claw-backend";
 import {
   MASTER_CODEX_NODE_BACKEND,
   isReadyMasterCodexNodeBackend,
 } from "@/lib/execution/backends/master-codex-node-backend";
 import { OPENAI_BACKEND, isReadyOpenAiBackend } from "@/lib/execution/backends/openai-backend";
+import type { ExecutionRequestKind } from "@/lib/execution/types";
 
 export interface ExecutionBackendSelectionInput {
   primary: {
@@ -18,9 +24,13 @@ export interface ExecutionBackendSelectionInput {
     provider: AiProvider;
     status: AiAccountStatus;
   }>;
+  requestKind?: ExecutionRequestKind;
+  requestedBackendId?: string;
+  claw?: ClawBackendSelectionState;
 }
 
 export type ExecutionBackendChoice =
+  | typeof CLAW_BACKEND
   | typeof MASTER_CODEX_NODE_BACKEND
   | typeof OPENAI_BACKEND
   | typeof ALIYUN_QWEN_BACKEND;
@@ -39,6 +49,14 @@ function resolveBackendByProvider(provider: AiProvider): ExecutionBackendChoice
 }
 
 function isReadyBackend(choice: ExecutionBackendChoice, input: ExecutionBackendSelectionInput) {
+  if (choice.backendId === CLAW_BACKEND.backendId) {
+    const requestKind = input.requestKind;
+    if (!input.claw?.enabled || !requestKind) {
+      return false;
+    }
+    return isClawRequestKindSupported(requestKind);
+  }
+
   const candidates = [
     ...(input.primary.provider === choice.provider ? [input.primary] : []),
     ...input.backups.filter((item) => item.provider === choice.provider),
@@ -79,6 +97,13 @@ export function listExecutionBackendChoices(
     seen.add(backend.backendId);
   };
 
+  if (
+    input.requestedBackendId === CLAW_BACKEND.backendId &&
+    isReadyBackend(CLAW_BACKEND, input)
+  ) {
+    pushBackend(CLAW_BACKEND);
+  }
+
   if (input.primary.status === "ready") {
     pushBackend(primaryBackend);
   }