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>

service/singleton/singleton.go

@@ -94,11 +94,21 @@ func InitDBFromPath(path string) error {
 		model.Notification{}, model.AlertRule{}, model.Service{}, model.NotificationGroupNotification{},
 		model.Cron{}, model.Transfer{}, model.ServerGroupServer{},
 		model.NAT{}, model.DDNSProfile{}, model.NotificationGroupNotification{},
-		model.WAF{}, model.Oauth2Bind{}, model.ServerTransfer{}, model.JWTSession{})
+		model.WAF{}, model.Oauth2Bind{}, model.ServerTransfer{}, model.JWTSession{},
+		model.APIToken{}, model.MCPAuditLog{})
 	if err != nil {
 		return err
 	}
 
+	// 旧 mcp:* scope 与 nezha:* 并行了一段时间，HasScope 通过别名让 mcp:fs:write
+	// 静默扩到 REST nezha:server:write。统一命名后这里把残留旧 scope 一次性
+	// 归一化（或在仅剩危险旧 scope 时整张 PAT 删除），保证运行时不再依赖别名。
+	if rewritten, deleted, mErr := model.MigrateLegacyMCPScopes(DB); mErr != nil {
+		log.Printf("NEZHA>> MigrateLegacyMCPScopes failed: %v", mErr)
+	} else if rewritten > 0 || deleted > 0 {
+		log.Printf("NEZHA>> Migrated legacy mcp:* api token scopes: rewritten=%d deleted=%d", rewritten, deleted)
+	}
+
 	return nil
 }