feat(tenancy): add Workspace multi-tenant foundation (#2353)

* Document multi-tenant workspace architecture

* Add OSS and commercial workspace boundaries

* docs: redesign multi-tenant workspace architecture

* feat(tenancy): implement workspace isolation

* docs(tenancy): record verification evidence

* docs(tenancy): revise single-instance SaaS topology

* docs(tenancy): refine architecture options

* docs: finalize cloud v2 multi-tenant decisions

* feat(tenancy): establish cloud isolation foundations

* feat(tenancy): harden shared cloud runtime boundaries

* docs(tenancy): record final isolation verification

* fix(tenancy): close isolation and permission gaps

* docs(tenancy): record final isolation verification

* feat(tenancy): connect cloud workspace control plane

* fix(build): install git for pinned SDK

* docs(cloud): update control plane verification

* chore: update multi-tenant SDK pin

* fix(cloud): skip legacy model sync during startup

* test(cloud): preserve minimal model manager fixtures

* fix(cloud): preserve authenticated account context

* fix(cloud): reuse authenticated account for user info

* feat(cloud): complete Workspace settings navigation

* test(web): cover Workspace dropdown menu

* feat(web): place workspace controls in sidebar

* refactor(web): streamline workspace controls

* style(web): format workspace layout test

* fix(cloud): surface runtime and workspace plan status

* fix(plugin): keep runtime identity stable across restarts

* fix(ui): widen and center workspace switcher

* fix(ui): hide roles from workspace switcher

* fix(ui): align workspace switcher with sidebar entries

* feat(workspace): add in-product collaboration and direct Cloud launch

* style: format collaboration changes

* fix(workspace): bind collaboration APIs to tenant UoW

* fix(cloud): preserve Core-owned collaboration state

* test(cloud): require Space identity for invite registration

* feat(cloud): complete secure invitation experience

* style(web): format invitation flows

* fix(cloud): recover box runtime without unscoped skill reload

* feat(oss): enforce invitation account and owner billing flows

* style: format OSS account service

* test(oss): cover invitation logout handoff

* fix(oss): resolve workspace owner in scoped session

* feat(cloud): harden multi-tenant runtime resources

* fix(cloud): bound runtime restart storms

* fix(cloud): eliminate periodic runtime CPU spikes

* fix(cloud): enforce instance capacity ceilings

* fix(cloud): scope public login capability discovery

* fix(cloud): bound tenant maintenance and monitoring work

* fix(runtime): bound tenant resource amplification

* fix(deps): pin green multi-tenant plugin SDK

* fix(cloud): handle unavailable skill capability

* fix(security): require authentication for image file endpoint (H-2)

- Changed /api/v1/files/image from AuthType.NONE to USER_TOKEN_OR_API_KEY
- Added Permission.RESOURCE_VIEW requirement
- Prevents unauthenticated cross-tenant file access via leaked keys
- Fixes HIGH severity finding from multi-tenant security review

docs: add comprehensive database migration guide
- Complete migration steps for OSS → multi-tenant
- Backup, execution, verification procedures
- Rollback scenarios and recovery plans
- Performance tuning recommendations

* test: add comprehensive cross-tenant isolation tests

Added 7 critical test scenarios for multi-tenant boundaries:
- Cross-tenant bot access prevention
- Viewer role read-only enforcement
- Removed member immediate access revocation
- Model provider credential isolation
- WebSocket message isolation
- Invitation token workspace scoping
- Multi-workspace context validation

These tests address P0-2 coverage gaps for:
- workspaces.py (membership & invitation flows)
- user.py (authentication & authorization)
- websocket_chat.py (real-time isolation)
- plugins.py (resource access control)

docs: finalize database migration guide

* fix(security): resolve M-1, M-2, M-3 security findings

M-1: WebSocket authorization TOCTOU race (FIXED)
- Changed _revalidate_websocket_authorization to return RequestContext
- Ensures validated context is used immediately without race window
- Prevents removed members from sending messages during revalidation gap

M-2: Model Manager cache workspace isolation (VERIFIED)
- Confirmed _CacheKey already uses 4-tuple: (instance, workspace, generation, resource)
- Cache is properly scoped per workspace, no cross-tenant leakage possible
- No code change needed, documented as working correctly

M-3: Invitation lock workspace scoping (FIXED)
- Changed lock key from token_digest to workspace_uuid:token_digest
- Prevents DoS where attacker locks token in Workspace A to block Workspace B
- Locks now isolated per workspace

All MEDIUM severity findings from security review now resolved.

* fix(cloud): unblock tenant CI and enforce knowledge quotas

* fix(tenancy): scope rerank model sync

---------

Co-authored-by: dadachann <185672915+dadachann@users.noreply.github.com>

web/src/app/login/page.tsx

@@ -19,8 +19,14 @@ import {
   FormLabel,
   FormMessage,
 } from '@/components/ui/form';
-import { useEffect, useState } from 'react';
-import { httpClient, initializeUserInfo } from '@/app/infra/http';
+import { useCallback, useEffect, useRef, useState } from 'react';
+import {
+  beginAuthenticatedSession,
+  bootstrapWorkspaceSession,
+  clearPendingInvitationToken,
+  getPendingInvitationToken,
+  httpClient,
+} from '@/app/infra/http';
 import { useNavigate } from 'react-router-dom';
 import {
   Mail,
@@ -43,17 +49,24 @@ const formSchema = (t: (key: string) => string) =>
     password: z.string().min(1, t('common.emptyPassword')),
   });
 
-type AccountType = 'local' | 'space';
+const TERMINAL_INVITATION_ERROR_CODES = new Set([
+  'invitation_invalid',
+  'invitation_expired',
+  'invitation_revoked',
+  'invitation_used',
+  'invitation_email_mismatch',
+]);
 
 export default function Login() {
   const navigate = useNavigate();
   const { t } = useTranslation();
   const [spaceLoading, setSpaceLoading] = useState(false);
-  const [accountType, setAccountType] = useState<AccountType | null>(null);
-  const [hasPassword, setHasPassword] = useState(false);
+  const [showLocalLogin, setShowLocalLogin] = useState(false);
+  const [showSpaceLogin, setShowSpaceLogin] = useState(false);
   const [loading, setLoading] = useState(true);
   const [loadError, setLoadError] = useState<string | null>(null);
   const [retrying, setRetrying] = useState(false);
+  const autoSpaceLoginStarted = useRef(false);
 
   const form = useForm<z.infer<ReturnType<typeof formSchema>>>({
     resolver: zodResolver(formSchema(t)),
@@ -75,8 +88,8 @@ export default function Login() {
         navigate('/register');
         return;
       }
-      setAccountType(res.account_type || 'local');
-      setHasPassword(res.has_password || false);
+      setShowLocalLogin(res.password_login_enabled !== false);
+      setShowSpaceLogin(res.space_login_enabled !== false);
       setLoading(false);
 
       // Also check if already logged in
@@ -109,15 +122,64 @@ export default function Login() {
   function checkIfAlreadyLoggedIn() {
     httpClient
       .checkUserToken()
-      .then((res) => {
+      .then(async (res) => {
         if (res.token) {
-          localStorage.setItem('token', res.token);
-          navigate('/home');
+          await finishLogin(res.token);
         }
       })
       .catch(() => {});
   }
 
+  async function finishLogin(
+    token: string,
+    username?: string,
+  ): Promise<boolean> {
+    beginAuthenticatedSession(token, username);
+
+    const invitationToken = getPendingInvitationToken();
+    let preferredWorkspaceUuid: string | undefined;
+    if (invitationToken) {
+      try {
+        const response =
+          await httpClient.acceptWorkspaceInvitation(invitationToken);
+        beginAuthenticatedSession(response.token, username);
+        preferredWorkspaceUuid = response.workspace_uuid;
+        clearPendingInvitationToken();
+      } catch (error) {
+        const apiError = error as { code?: string };
+        const errorCode =
+          typeof apiError.code === 'string'
+            ? apiError.code
+            : 'invitation_accept_failed';
+        const invitationPath = TERMINAL_INVITATION_ERROR_CODES.has(errorCode)
+          ? `/invitations/accept?error=${encodeURIComponent(errorCode)}`
+          : '/invitations/accept';
+        navigate(invitationPath, { replace: true });
+        toast.error(
+          t(
+            errorCode === 'invitation_email_mismatch'
+              ? 'workspace.invitationEmailMismatch'
+              : 'workspace.invitationAcceptFailed',
+          ),
+        );
+        return false;
+      }
+    }
+
+    const result = await bootstrapWorkspaceSession({
+      preferredWorkspaceUuid,
+    });
+    if (result.status === 'selection-required') {
+      navigate('/workspaces/select?returnTo=%2Fhome', { replace: true });
+      return true;
+    }
+    if (result.status === 'unavailable') {
+      throw new Error('No Workspace is available for this Account');
+    }
+    navigate('/home');
+    return true;
+  }
+
   function onSubmit(values: z.infer<ReturnType<typeof formSchema>>) {
     handleLogin(values.email, values.password);
   }
@@ -126,18 +188,16 @@ export default function Login() {
     httpClient
       .authUser(username, password)
       .then(async (res) => {
-        localStorage.setItem('token', res.token);
-        localStorage.setItem('userEmail', username);
-        await initializeUserInfo();
-        navigate('/home');
-        toast.success(t('common.loginSuccess'));
+        if (await finishLogin(res.token, username)) {
+          toast.success(t('common.loginSuccess'));
+        }
       })
       .catch(() => {
         toast.error(t('common.loginFailed'));
       });
   }
 
-  const handleSpaceLoginClick = async () => {
+  const handleSpaceLoginClick = useCallback(async () => {
     setSpaceLoading(true);
     try {
       const currentOrigin = window.location.origin;
@@ -148,7 +208,20 @@ export default function Login() {
       toast.error(t('common.spaceLoginFailed'));
       setSpaceLoading(false);
     }
-  };
+  }, [t]);
+
+  useEffect(() => {
+    if (
+      loading ||
+      !showSpaceLogin ||
+      autoSpaceLoginStarted.current ||
+      new URLSearchParams(window.location.search).get('auto') !== 'space'
+    ) {
+      return;
+    }
+    autoSpaceLoginStarted.current = true;
+    void handleSpaceLoginClick();
+  }, [handleSpaceLoginClick, loading, showSpaceLogin]);
 
   if (loading) {
     return (
@@ -211,11 +284,6 @@ export default function Login() {
     );
   }
 
-  // Determine what to show based on account type
-  const showLocalLogin =
-    accountType === 'local' || (accountType === 'space' && hasPassword);
-  const showSpaceLogin = accountType === 'space';
-
   return (
     <div className="min-h-screen flex items-center justify-center bg-gray-50 dark:dark:bg-neutral-900">
       <Card className="w-[375px] shadow-lg dark:shadow-white/10">
@@ -237,7 +305,7 @@ export default function Login() {
           </CardDescription>
         </CardHeader>
         <CardContent className="space-y-6">
-          {/* Space Login - only show for space accounts */}
+          {/* Space and password login are per-account capabilities. */}
           {showSpaceLogin && (
             <div className="space-y-3">
               <Button
@@ -270,7 +338,7 @@ export default function Login() {
             </div>
           )}
 
-          {/* Local Account Login - show for local accounts or space accounts with password */}
+          {/* Password login remains available to every account with a password. */}
           {showLocalLogin && (
             <Form {...form}>
               <form