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/transfer_cancel_authz_test.go

@@ -0,0 +1,104 @@
+package controller
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"strconv"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+	"github.com/stretchr/testify/assert"
+
+	"github.com/nezhahq/nezha/model"
+	"github.com/nezhahq/nezha/service/singleton"
+)
+
+// cancelServerTransfer 的核心租户安全语义：
+//   - admin 可以取消任意 transfer 行
+//   - member 只能取消自己作为 FromUserID 的 transfer
+//   - 行不存在 vs 行存在但调用者不是 FromUserID 必须返回**相同的** "permission denied"，
+//     避免通过响应差异枚举 transfer ID 是否存在
+//
+// 该 handler 已有保护（transfer.go:73-80），但此前没有任何测试盯住它。
+
+func seedPendingTransfer(t *testing.T, serverID, fromUID, toUID, initUID uint64) uint64 {
+	t.Helper()
+	tr := &model.ServerTransfer{
+		ServerID:    serverID,
+		FromUserID:  fromUID,
+		ToUserID:    toUID,
+		InitiatorID: initUID,
+		Status:      model.ServerTransferStatusPending,
+	}
+	assert.NoError(t, singleton.DB.Create(tr).Error)
+	singleton.ServerTransferShared.Register(tr)
+	return tr.ID
+}
+
+func callCancelServerTransfer(t *testing.T, transferID, callerID uint64, role model.Role) (commonResponseShape, int) {
+	t.Helper()
+	r := gin.New()
+	r.Use(func(c *gin.Context) {
+		setAuthUser(c, callerID, role)
+		c.Next()
+	})
+	r.POST("/transfer/:id/cancel", commonHandler(cancelServerTransfer))
+
+	w := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodPost,
+		"/transfer/"+strconv.FormatUint(transferID, 10)+"/cancel",
+		bytes.NewReader(nil))
+	r.ServeHTTP(w, req)
+
+	var resp commonResponseShape
+	assert.NoError(t, json.Unmarshal(w.Body.Bytes(), &resp))
+	return resp, w.Code
+}
+
+func TestCancelServerTransfer_MemberCancelsOwnTransfer(t *testing.T) {
+	cleanup := setupRetryServerTransferFixture(t)
+	defer cleanup()
+	seedServer(t, 1, 100)
+	id := seedPendingTransfer(t, 1, 100, 200, 100)
+
+	resp, status := callCancelServerTransfer(t, id, 100, model.RoleMember)
+	assert.Equal(t, http.StatusOK, status)
+	assert.True(t, resp.Success, "FromUserID member must be able to cancel own transfer: %s", resp.Error)
+}
+
+func TestCancelServerTransfer_MemberCannotCancelOthers(t *testing.T) {
+	cleanup := setupRetryServerTransferFixture(t)
+	defer cleanup()
+	seedServer(t, 1, 100)
+	id := seedPendingTransfer(t, 1, 100, 200, 100)
+
+	resp, status := callCancelServerTransfer(t, id, 200, model.RoleMember)
+	assert.Equal(t, http.StatusOK, status)
+	assert.False(t, resp.Success, "ToUserID member must NOT be able to cancel another user's transfer")
+	assert.Contains(t, resp.Error, "permission denied")
+}
+
+func TestCancelServerTransfer_MemberCannotEnumerateNonexistentIDs(t *testing.T) {
+	cleanup := setupRetryServerTransferFixture(t)
+	defer cleanup()
+
+	resp, status := callCancelServerTransfer(t, 99999, 100, model.RoleMember)
+	assert.Equal(t, http.StatusOK, status)
+	assert.False(t, resp.Success)
+	assert.Contains(t, resp.Error, "permission denied",
+		"nonexistent transfer must return the SAME error as 'not your transfer', "+
+			"so an attacker can't probe which transfer IDs exist")
+}
+
+func TestCancelServerTransfer_AdminCancelsAny(t *testing.T) {
+	cleanup := setupRetryServerTransferFixture(t)
+	defer cleanup()
+	seedServer(t, 1, 100)
+	id := seedPendingTransfer(t, 1, 100, 200, 100)
+
+	resp, status := callCancelServerTransfer(t, id, 999, model.RoleAdmin)
+	assert.Equal(t, http.StatusOK, status)
+	assert.True(t, resp.Success, "admin must be able to cancel any transfer: %s", resp.Error)
+}