feat(opencode): 用量窗口支持同 Key 组共享、活动防抖与超窗强刷

与 Ollama Cloud usage 对齐：OpenCode Go 作为同 Key 聚合订阅，
多个 openai/apikey/base_url=opencode.ai/zen/go/v1 账号共享同一份
用量状态与刷新节奏：

- 组共享：组指纹 sha256("opencode.ai\0"+api_key)；auto_refresh 开关
  与 snapshot 按组写（事务 + FOR NO KEY UPDATE + 锚点 CAS + 纯合并，
  写 snapshot 不会抹掉开关）；列表/详情经 ResolveAccounts 组内共享；
  账号换 Key → IdentityChanged → 组级关闭 auto_refresh 并清快照
- 活动防抖 + 超窗强刷：settings 新增 debounce_minutes（默认 1，
  1-60，必须小于 interval_minutes）；模型请求活动经网关 5 处调用点
  驱动刷新，due = min(lastUsed+debounce, fetchedAt+maxWait)，
  成功路径有 5 分钟最小抓取间隔，失败路径退避优先
- 手动刷新限频 10s→30s 且按组；singleflight/RunDue 按组去重；
  ListDue 在 SQL 内按组算 due（CTE 分组取组内 MAX(last_used_at)）

验证：go build + 五包回归 OK；新增组共享/三态 due/组单飞/
IdentityChanged/debounce 校验单测全绿；vitest 11 例全绿；
vue-tsc 零错误。

backend/internal/handler/admin/account_handler.go

@@ -679,14 +679,22 @@ func (h *AccountHandler) List(c *gin.Context) {
 		response.ErrorFrom(c, err)
 		return
 	}
-	if h.ollamaCloudUsage != nil && len(accounts) > 0 {
+	if len(accounts) > 0 {
 		accountPointers := make([]*service.Account, len(accounts))
 		for index := range accounts {
 			accountPointers[index] = &accounts[index]
 		}
-		if err := h.ollamaCloudUsage.ResolveAccounts(c.Request.Context(), accountPointers); err != nil {
-			response.ErrorFrom(c, err)
-			return
+		if h.ollamaCloudUsage != nil {
+			if err := h.ollamaCloudUsage.ResolveAccounts(c.Request.Context(), accountPointers); err != nil {
+				response.ErrorFrom(c, err)
+				return
+			}
+		}
+		if h.opencodeGoUsage != nil {
+			if err := h.opencodeGoUsage.ResolveOpenCodeGoUsageAccounts(c.Request.Context(), accountPointers); err != nil {
+				response.ErrorFrom(c, err)
+				return
+			}
 		}
 	}
 
@@ -947,6 +955,12 @@ func (h *AccountHandler) GetByID(c *gin.Context) {
 			return
 		}
 	}
+	if h.opencodeGoUsage != nil {
+		if err := h.opencodeGoUsage.ResolveOpenCodeGoUsageAccounts(c.Request.Context(), []*service.Account{account}); err != nil {
+			response.ErrorFrom(c, err)
+			return
+		}
+	}
 
 	response.Success(c, h.buildAccountResponseWithRuntime(c.Request.Context(), account))
 }

backend/internal/handler/admin/account_opencode_go_usage_test.go

@@ -32,13 +32,49 @@ func (r *openCodeGoUsageHandlerTestRepo) GetByID(_ context.Context, id int64) (*
 	return nil, service.ErrAccountNotFound
 }
 
+func (r *openCodeGoUsageHandlerTestRepo) ListOpenCodeGoUsageGroupAccounts(_ context.Context, anchors []*service.Account) ([]service.Account, error) {
+	wanted := make(map[string]struct{}, len(anchors))
+	for _, anchor := range anchors {
+		if apiKey, ok := openCodeGoUsageHandlerTestAPIKey(anchor); ok {
+			wanted[apiKey] = struct{}{}
+		}
+	}
+	result := make([]service.Account, 0, len(r.accounts)+1)
+	if r.account != nil {
+		if apiKey, ok := openCodeGoUsageHandlerTestAPIKey(r.account); ok {
+			if _, match := wanted[apiKey]; match {
+				result = append(result, *r.account)
+			}
+		}
+	}
+	for _, account := range r.accounts {
+		if apiKey, ok := openCodeGoUsageHandlerTestAPIKey(account); ok {
+			if _, match := wanted[apiKey]; match {
+				result = append(result, *account)
+			}
+		}
+	}
+	return result, nil
+}
+
+func openCodeGoUsageHandlerTestAPIKey(account *service.Account) (string, bool) {
+	if account == nil || account.Credentials == nil {
+		return "", false
+	}
+	apiKey, ok := account.Credentials["api_key"].(string)
+	return apiKey, ok && apiKey != ""
+}
+
 func (r *openCodeGoUsageHandlerTestRepo) SetOpenCodeGoUsageAutoRefresh(context.Context, *service.Account, bool) error {
 	return nil
 }
 func (r *openCodeGoUsageHandlerTestRepo) UpdateOpenCodeGoUsageSnapshot(context.Context, *service.Account, *service.OpenCodeGoUsageSnapshot) error {
 	return nil
 }
-func (r *openCodeGoUsageHandlerTestRepo) ListDueOpenCodeGoUsageAccounts(context.Context, time.Time, int) ([]service.Account, error) {
+func (r *openCodeGoUsageHandlerTestRepo) DisableOpenCodeGoUsageAutoRefresh(context.Context, *service.Account) error {
+	return nil
+}
+func (r *openCodeGoUsageHandlerTestRepo) ListDueOpenCodeGoUsageAccounts(context.Context, time.Time, time.Duration, time.Duration, int) ([]service.Account, error) {
 	return nil, nil
 }