feat: implement multi-user access and invite flows (#3784)

## Thinking Path

> - Paperclip is the control plane for autonomous AI companies.
> - V1 needs to stay local-first while also supporting shared,
authenticated deployments.
> - Human operators need real identities, company membership, invite
flows, profile surfaces, and company-scoped access controls.
> - Agents and operators also need the existing issue, inbox, workspace,
approval, and plugin flows to keep working under those authenticated
boundaries.
> - This branch accumulated the multi-user implementation, follow-up QA
fixes, workspace/runtime refinements, invite UX improvements,
release-branch conflict resolution, and review hardening.
> - This pull request consolidates that branch onto the current `master`
branch as a single reviewable PR.
> - The benefit is a complete multi-user implementation path with tests
and docs carried forward without dropping existing branch work.

## What Changed

- Added authenticated human-user access surfaces: auth/session routes,
company user directory, profile settings, company access/member
management, join requests, and invite management.
- Added invite creation, invite landing, onboarding, logo/branding,
invite grants, deduped join requests, and authenticated multi-user E2E
coverage.
- Tightened company-scoped and instance-admin authorization across
board, plugin, adapter, access, issue, and workspace routes.
- Added profile-image URL validation hardening, avatar preservation on
name-only profile updates, and join-request uniqueness migration cleanup
for pending human requests.
- Added an atomic member role/status/grants update path so Company
Access saves no longer leave partially updated permissions.
- Improved issue chat, inbox, assignee identity rendering,
sidebar/account/company navigation, workspace routing, and execution
workspace reuse behavior for multi-user operation.
- Added and updated server/UI tests covering auth, invites, membership,
issue workspace inheritance, plugin authz, inbox/chat behavior, and
multi-user flows.
- Merged current `public-gh/master` into this branch, resolved all
conflicts, and verified no `pnpm-lock.yaml` change is included in this
PR diff.

## Verification

- `pnpm exec vitest run server/src/__tests__/issues-service.test.ts
ui/src/components/IssueChatThread.test.tsx ui/src/pages/Inbox.test.tsx`
- `pnpm run preflight:workspace-links && pnpm exec vitest run
server/src/__tests__/plugin-routes-authz.test.ts`
- `pnpm exec vitest run server/src/__tests__/plugin-routes-authz.test.ts
server/src/__tests__/workspace-runtime-service-authz.test.ts
server/src/__tests__/access-validators.test.ts`
- `pnpm exec vitest run
server/src/__tests__/authz-company-access.test.ts
server/src/__tests__/routines-routes.test.ts
server/src/__tests__/sidebar-preferences-routes.test.ts
server/src/__tests__/approval-routes-idempotency.test.ts
server/src/__tests__/openclaw-invite-prompt-route.test.ts
server/src/__tests__/agent-cross-tenant-authz-routes.test.ts
server/src/__tests__/routines-e2e.test.ts`
- `pnpm exec vitest run server/src/__tests__/auth-routes.test.ts
ui/src/pages/CompanyAccess.test.tsx`
- `pnpm --filter @paperclipai/shared typecheck && pnpm --filter
@paperclipai/db typecheck && pnpm --filter @paperclipai/server
typecheck`
- `pnpm --filter @paperclipai/shared typecheck && pnpm --filter
@paperclipai/server typecheck`
- `pnpm --filter @paperclipai/ui typecheck`
- `pnpm db:generate`
- `npx playwright test --config tests/e2e/playwright.config.ts --list`
- Confirmed branch has no uncommitted changes and is `0` commits behind
`public-gh/master` before PR creation.
- Confirmed no `pnpm-lock.yaml` change is staged or present in the PR
diff.

## Risks

- High review surface area: this PR contains the accumulated multi-user
branch plus follow-up fixes, so reviewers should focus especially on
company-boundary enforcement and authenticated-vs-local deployment
behavior.
- UI behavior changed across invites, inbox, issue chat, access
settings, and sidebar navigation; no browser screenshots are included in
this branch-consolidation PR.
- Plugin install, upgrade, and lifecycle/config mutations now require
instance-admin access, which is intentional but may change expectations
for non-admin board users.
- A join-request dedupe migration rejects duplicate pending human
requests before creating unique indexes; deployments with unusual
historical duplicates should review the migration behavior.
- Company member role/status/grant saves now use a new combined
endpoint; older separate endpoints remain for compatibility.
- Full production build was not run locally in this heartbeat; CI should
cover the full matrix.

## Model Used

- OpenAI Codex coding agent, GPT-5-based model, CLI/tool-use
environment. Exact deployed model identifier and context window were not
exposed by the runtime.

## Checklist

- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] If this change affects the UI, I have included before/after
screenshots
- [x] I have updated relevant documentation to reflect my changes
- [x] I have considered and documented any risks above
- [x] I will address all Greptile and reviewer comments before
requesting merge

Note on screenshots: this is a branch-consolidation PR for an
already-developed multi-user branch, and no browser screenshots were
captured during this heartbeat.

---------

Co-authored-by: dotta <dotta@example.com>
Co-authored-by: Paperclip <noreply@paperclip.ing>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

server/src/__tests__/plugin-routes-authz.test.ts

@@ -5,11 +5,15 @@ import { beforeEach, describe, expect, it, vi } from "vitest";
 const mockRegistry = vi.hoisted(() => ({
   getById: vi.fn(),
   getByKey: vi.fn(),
+  upsertConfig: vi.fn(),
 }));
 
 const mockLifecycle = vi.hoisted(() => ({
   load: vi.fn(),
   upgrade: vi.fn(),
+  unload: vi.fn(),
+  enable: vi.fn(),
+  disable: vi.fn(),
 }));
 
 vi.mock("../services/plugin-registry.js", () => ({
@@ -138,6 +142,31 @@ describe("plugin install and upgrade authz", () => {
     expect(mockLifecycle.upgrade).not.toHaveBeenCalled();
   }, 20_000);
 
+  it.each([
+    ["delete", "delete", "/api/plugins/11111111-1111-4111-8111-111111111111", undefined],
+    ["enable", "post", "/api/plugins/11111111-1111-4111-8111-111111111111/enable", {}],
+    ["disable", "post", "/api/plugins/11111111-1111-4111-8111-111111111111/disable", {}],
+    ["config", "post", "/api/plugins/11111111-1111-4111-8111-111111111111/config", { configJson: {} }],
+  ] as const)("rejects plugin %s for non-admin board users", async (_name, method, path, body) => {
+    const { app } = await createApp({
+      type: "board",
+      userId: "user-1",
+      source: "session",
+      isInstanceAdmin: false,
+      companyIds: ["company-1"],
+    });
+
+    const req = method === "delete" ? request(app).delete(path) : request(app).post(path).send(body);
+    const res = await req;
+
+    expect(res.status).toBe(403);
+    expect(mockRegistry.getById).not.toHaveBeenCalled();
+    expect(mockRegistry.upsertConfig).not.toHaveBeenCalled();
+    expect(mockLifecycle.unload).not.toHaveBeenCalled();
+    expect(mockLifecycle.enable).not.toHaveBeenCalled();
+    expect(mockLifecycle.disable).not.toHaveBeenCalled();
+  }, 20_000);
+
   it("allows instance admins to upgrade plugins", async () => {
     const pluginId = "11111111-1111-4111-8111-111111111111";
     mockRegistry.getById.mockResolvedValue({