fix(ai-chat): OpenAI Chat Completions for multi-turn + provider settings, stream UX & errors" -m "Live-stand fixes (OpenRouter / OpenAI-compatible):

- openai provider: use .chat() (Chat Completions) instead of the default callable
  (Responses API), which gateways reject on multi-turn -> 400.
- updateAiProviderSettings: assemble settings.ai.provider via jsonb_build_object
  with ::text-cast bound params + jsonb_typeof self-heal (postgres.js was
  double-encoding it into an array; the ::text cast avoids 'could not determine
  data type of parameter').
- chat agent: drop the hard maxOutputTokens cap (truncated complex tool calls);
  keep a tiny cap only on the test-connection ping.
- testConnection + chat stream: surface the real provider error (statusCode+message)
  to logs and the UI instead of generic masks; never log the API key.
- chat UI: typing indicator, incremental streaming render, tool 'running' status, Stop.

Also bundled (prior uncommitted ai-chat work):
- history 'AI agent' provenance badge; vector RAG (pgvector image + page_embeddings
  + AI_QUEUE indexer + space-scoped semanticSearch); external MCP servers backend
  (@ai-sdk/mcp client, SSRF IP-pinning, encrypted headers, admin CRUD/Test);
  yjs duplicate-instance fix via pnpm patch (single CJS instance server-side).

apps/server/src/database/database.module.ts

@@ -30,6 +30,8 @@ import { TemplateRepo } from '@docmost/db/repos/template/template.repo';
 import { AiChatRepo } from '@docmost/db/repos/ai-chat/ai-chat.repo';
 import { AiChatMessageRepo } from '@docmost/db/repos/ai-chat/ai-chat-message.repo';
 import { AiProviderCredentialsRepo } from '@docmost/db/repos/ai-chat/ai-provider-credentials.repo';
+import { AiMcpServerRepo } from '@docmost/db/repos/ai-chat/ai-mcp-server.repo';
+import { PageEmbeddingRepo } from '@docmost/db/repos/ai-chat/page-embedding.repo';
 import { PageListener } from '@docmost/db/listeners/page.listener';
 import { PostgresJSDialect } from 'kysely-postgres-js';
 import * as postgres from 'postgres';
@@ -98,6 +100,8 @@ import { normalizePostgresUrl } from '../common/helpers';
     AiChatRepo,
     AiChatMessageRepo,
     AiProviderCredentialsRepo,
+    AiMcpServerRepo,
+    PageEmbeddingRepo,
     PageListener,
   ],
   exports: [
@@ -126,6 +130,8 @@ import { normalizePostgresUrl } from '../common/helpers';
     AiChatRepo,
     AiChatMessageRepo,
     AiProviderCredentialsRepo,
+    AiMcpServerRepo,
+    PageEmbeddingRepo,
   ],
 })
 export class DatabaseModule implements OnApplicationBootstrap {