refactor: replace WASM-based PoW with a high-performance native Go implementation and add context support for cancellation.

internal/deepseek/client_auth.go

@@ -109,7 +109,7 @@ func (c *Client) GetPow(ctx context.Context, a *auth.RequestAuth, maxAttempts in
 			data, _ := resp["data"].(map[string]any)
 			bizData, _ := data["biz_data"].(map[string]any)
 			challenge, _ := bizData["challenge"].(map[string]any)
-			answer, err := ComputePow(challenge)
+			answer, err := ComputePow(ctx, challenge)
 			if err != nil {
 				attempts++
 				continue

internal/deepseek/pow.go

@@ -1,6 +1,7 @@
 package deepseek
 
 import (
+	"context"
 	"encoding/base64"
 	"encoding/json"
 	"errors"
@@ -9,7 +10,7 @@ import (
 )
 
 // ComputePow 使用纯 Go 实现求解 PoW challenge (DeepSeekHashV1)。
-func ComputePow(challenge map[string]any) (int64, error) {
+func ComputePow(ctx context.Context, challenge map[string]any) (int64, error) {
 	algo, _ := challenge["algorithm"].(string)
 	if algo != "DeepSeekHashV1" {
 		return 0, errors.New("unsupported algorithm")
@@ -19,7 +20,7 @@ func ComputePow(challenge map[string]any) (int64, error) {
 	expireAt := toInt64(challenge["expire_at"], 1680000000)
 	difficulty := toInt64FromFloat(challenge["difficulty"], 144000)
 
-	return pow.SolvePow(challengeStr, salt, expireAt, difficulty)
+	return pow.SolvePow(ctx, challengeStr, salt, expireAt, difficulty)
 }
 
 // BuildPowHeader 序列化 {algorithm,challenge,salt,answer,signature,target_path} 为 base64(JSON)。

internal/deepseek/pow_test.go

@@ -13,7 +13,7 @@ func TestPreloadPowNoOp(t *testing.T) {
 }
 
 func TestComputePowUnsupportedAlgorithm(t *testing.T) {
-	_, err := ComputePow(map[string]any{"algorithm": "unknown"})
+	_, err := ComputePow(context.Background(), map[string]any{"algorithm": "unknown"})
 	if err == nil {
 		t.Fatal("expected error for unsupported algorithm")
 	}