feat(auth): add PAT auth, scoped REST/MCP access, CSRF, and tenant isolation

Introduce Personal Access Tokens (nzp_*) as a stateless auth path alongside
JWT, gated per-endpoint by a scope middleware (nezha:{resource}:{verb}) with
fail-closed empty-scope defaults and a server-id whitelist. Self-management
endpoints (profile, api-tokens, oauth2 bind, refresh-token) explicitly reject
PATs to block privilege-escalation chains. A revoke registry tears down active
long-lived connections (terminal, fm, ws, transfer, mcp) the moment a PAT is
deleted, with a tombstone closing the revoke->register race.

Add an MCP endpoint that proxies tool calls (exec, fs read/write/delete,
transfer) to agents over gRPC, guarded by origin/DNS-rebinding checks, a
per-token rate limiter, audit logging, and a kill switch. Serialize all
sends through the IOStream wrapper to honour grpc-go's concurrency contract.

Add CSRF double-submit protection on unsafe cookie-authenticated methods,
exempting authenticated PAT requests by context identity (not a forgeable
Authorization header). Apply visibility/whitelist filtering consistently
across list, get-by-id, and mutate paths to enforce tenant isolation.

Migrate legacy mcp:* scopes: rewrite read/exec to nezha:* equivalents and
drop dangerous write/delete/wildcard grants.

Co-authored-by: cloudcode <cloudcode@users.noreply.github.com>

cmd/dashboard/controller/cron.go

@@ -50,10 +50,18 @@ func createCron(c *gin.Context) (uint64, error) {
 		return 0, err
 	}
 
-	if !singleton.ServerShared.CheckPermission(c, slices.Values(cf.Servers)) {
+	if !isValidCronCover(cf.Cover) {
 		return 0, singleton.Localizer.ErrorT("permission denied")
 	}
 
+	if err := checkCronServerListPermission(c, cf.Cover, cf.Servers, getUid(c)); err != nil {
+		return 0, err
+	}
+
+	if err := rejectImplicitCoverForLimitedPAT(c, cf.Cover, cf.Servers); err != nil {
+		return 0, err
+	}
+
 	if err := assertOwnsNotificationGroup(c, cf.NotificationGroupID); err != nil {
 		return 0, err
 	}
@@ -111,12 +119,8 @@ func updateCron(c *gin.Context) (any, error) {
 		return 0, err
 	}
 
-	if !singleton.ServerShared.CheckPermission(c, slices.Values(cf.Servers)) {
-		return 0, singleton.Localizer.ErrorT("permission denied")
-	}
-
-	if err := assertOwnsNotificationGroup(c, cf.NotificationGroupID); err != nil {
-		return nil, err
+	if !isValidCronCover(cf.Cover) {
+		return nil, singleton.Localizer.ErrorT("permission denied")
 	}
 
 	var cr model.Cron
@@ -128,6 +132,18 @@ func updateCron(c *gin.Context) (any, error) {
 		return nil, singleton.Localizer.ErrorT("permission denied")
 	}
 
+	if err := checkCronServerListPermission(c, cf.Cover, cf.Servers, cr.GetUserID()); err != nil {
+		return nil, err
+	}
+
+	if err := rejectImplicitCoverForLimitedPATWithOwner(c, cf.Cover, cf.Servers, cr.GetUserID()); err != nil {
+		return nil, err
+	}
+
+	if err := assertOwnsNotificationGroup(c, cf.NotificationGroupID); err != nil {
+		return nil, err
+	}
+
 	cr.TaskType = cf.TaskType
 	cr.Name = cf.Name
 	cr.Scheduler = cf.Scheduler
@@ -183,6 +199,14 @@ func manualTriggerCron(c *gin.Context) (any, error) {
 		return nil, singleton.Localizer.ErrorT("permission denied")
 	}
 
+	// 运行时回放写侧 rejectImplicitCoverForLimitedPAT* 同一条 PAT 收口：
+	// 历史脏数据 / 旁路写入的 cron 仍可能携带「CronCoverAll + 不充分 deny-list」
+	// 的配置；CronTrigger 没有 PAT 上下文，manualTrigger 这里是唯一阻止
+	// 受限 PAT 触发 fan-out 到白名单外 owner servers 的同步入口。
+	if err := enforcePATCronDispatchScope(c, cr); err != nil {
+		return nil, err
+	}
+
 	singleton.ManualTrigger(cr)
 	return nil, nil
 }
@@ -208,6 +232,19 @@ func batchDeleteCron(c *gin.Context) (any, error) {
 		return nil, singleton.Localizer.ErrorT("permission denied")
 	}
 
+	// 与 manualTriggerCron 对称：删除会改变 fan-out 范围本身，受限 PAT 不
+	// 应通过删除一个白名单内的「掩护」cron 间接放大对白名单外 owner servers
+	// 的影响。回放同一条 cover-fanout 收口。
+	for _, id := range cr {
+		existing, ok := singleton.CronShared.Get(id)
+		if !ok || existing == nil {
+			continue
+		}
+		if err := enforcePATCronDispatchScope(c, existing); err != nil {
+			return nil, err
+		}
+	}
+
 	if err := singleton.DB.Unscoped().Delete(&model.Cron{}, "id in (?)", cr).Error; err != nil {
 		return nil, newGormError("%v", err)
 	}