feat(ai-chat): agent write tools, provenance wiring, chat panel + provider settings UI" -m "Backend:

- Add reversible write tools to the per-user agent toolset (page create/update/
  move/soft-delete; comment reply + resolve), exposed under the user's JWT and
  enforced by Docmost CASL; no permanent/force delete (D3).
- Non-spoofable agent provenance: sign actor/aiChatId into the access and collab
  tokens (TokenService), propagate via jwt.strategy onto the request, and set
  pages.last_updated_source/last_updated_ai_chat_id on REST create/update/move and
  comments.created_source/resolved_source/ai_chat_id.
- packages/mcp: add an optional getCollabToken provider (content-edit provenance)
  and guard against empty tokens; service-account /mcp path unchanged.

Frontend:
- Admin 'AI / Models' settings section: provider/model/embedding/base URL, a
  write-only API key field, system prompt, and Test connection.
- AI chat panel (useChat + DefaultChatTransport): conversation list, streamed
  messages, tool-call action log and page citations; header entry point gated on
  settings.ai.chat.

Compile-verified (server nest build + client tsc/vite); not yet live-tested.
Known gaps: history 'AI agent' badge (C3), vector RAG (D), external MCP (E);
chat tool-card citation links pending a fix.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/server/src/core/comment/comment.controller.ts

@@ -17,6 +17,10 @@ import { ResolveCommentDto } from './dto/resolve-comment.dto';
 import { PageIdDto, CommentIdDto } from './dto/comments.input';
 import { AuthUser } from '../../common/decorators/auth-user.decorator';
 import { AuthWorkspace } from '../../common/decorators/auth-workspace.decorator';
+import {
+  AuthProvenance,
+  AuthProvenanceData,
+} from '../../common/decorators/auth-provenance.decorator';
 import { JwtAuthGuard } from '../../common/guards/jwt-auth.guard';
 import { PaginationOptions } from '@docmost/db/pagination/pagination-options';
 import { User, Workspace } from '@docmost/db/types/entity.types';
@@ -54,6 +58,7 @@ export class CommentController {
     @Body() createCommentDto: CreateCommentDto,
     @AuthUser() user: User,
     @AuthWorkspace() workspace: Workspace,
+    @AuthProvenance() provenance: AuthProvenanceData,
   ) {
     const page = await this.pageRepo.findById(createCommentDto.pageId);
     if (!page || page.deletedAt) {
@@ -69,6 +74,7 @@ export class CommentController {
         user,
       },
       createCommentDto,
+      provenance,
     );
 
     this.auditService.log({
@@ -147,6 +153,7 @@ export class CommentController {
     @Body() dto: ResolveCommentDto,
     @AuthUser() user: User,
     @AuthWorkspace() workspace: Workspace,
+    @AuthProvenance() provenance: AuthProvenanceData,
   ) {
     const comment = await this.commentRepo.findById(dto.commentId, {
       includeCreator: true,
@@ -172,6 +179,7 @@ export class CommentController {
       comment,
       dto.resolved,
       user,
+      provenance,
     );
 
     this.auditService.log({