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/server.go

@@ -38,9 +38,39 @@ func NewServerClass() *ServerClass {
 	}
 	sc.sortList()
 
+	model.OwnerServerIDsLookup = sc.ownerServerIDs
+	model.AllServerIDsLookup = sc.allServerIDs
+	model.OwnerIsAdminLookup = ownerIsAdmin
+
 	return sc
 }
 
+func (c *ServerClass) ownerServerIDs(ownerUID uint64) []uint64 {
+	var ids []uint64
+	c.Range(func(id uint64, s *model.Server) bool {
+		if s != nil && s.GetUserID() == ownerUID {
+			ids = append(ids, id)
+		}
+		return true
+	})
+	return ids
+}
+
+func (c *ServerClass) allServerIDs() []uint64 {
+	var ids []uint64
+	c.Range(func(id uint64, s *model.Server) bool {
+		if s != nil {
+			ids = append(ids, id)
+		}
+		return true
+	})
+	return ids
+}
+
+func ownerIsAdmin(ownerUID uint64) bool {
+	return userIsAdmin(ownerUID)
+}
+
 func (c *ServerClass) Update(s *model.Server, uuid string) {
 	c.listMu.Lock()
 
@@ -64,8 +94,11 @@ func (c *ServerClass) Delete(idList []uint64) {
 	c.listMu.Lock()
 
 	for _, id := range idList {
-		serverUUID := c.list[id].UUID
-		delete(c.uuidToID, serverUUID)
+		s, ok := c.list[id]
+		if !ok {
+			continue
+		}
+		delete(c.uuidToID, s.UUID)
 		delete(c.list, id)
 	}