docs: portmap shepard-mcp decommissioned; add doc-ingestion pipeline design

- portmap: mark port 18010 (shepard-mcp) as DECOMMISSIONED 2026-05-21;
  remove mcp-shepard from Gitea repos note
- services/doc-ingestion.md: new — n8n → Docling → LiteLLM embeddings →
  LobeChat knowledge base pipeline architecture + converter comparison table

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

infra/portmap.md

@@ -83,7 +83,7 @@ All arr-stack services run behind `vpn_gluetun` container network.
 | [18005](http://192.168.1.40:18005) | Docling MCP | `docling-mcp` | — | SAIA Docling PDF→Markdown; reachable via gateway |
 | [18007](http://192.168.1.40:18007) | Kroki MCP | `kroki-mcp` | — | Diagram rendering; reachable via gateway |
 | [18009](http://192.168.1.40:18009) | Speaches | `speaches` | — | TTS/STT; LAN only |
-| [18010](http://192.168.1.40:18010) | Shepard MCP | `shepard-mcp` | — | Shepard research platform; reachable via gateway |
+| ~~18010~~ | ~~Shepard MCP~~ | ~~`shepard-mcp`~~ | — | **DECOMMISSIONED 2026-05-21** — Shepard will provide a native MCP server |
 | [18011](http://192.168.1.40:18011) | Upload-artifact MCP | `upload-artifact-mcp` | — | S3 chat-artifacts upload; reachable via gateway |
 | — | SearXNG | `searxng` | — | Internal, `shared_backend`, used by LobeHub |
 
@@ -122,7 +122,7 @@ All arr-stack services run behind `vpn_gluetun` container network.
 | Port | Service | Container | Public URL | Notes |
 |---|---|---|---|---|
 <!-- Daytona DECOMMISSIONED 2026-05-20; replaced by Coder on CT 111. Compose renamed *.DECOMMISSIONED-2026-05-20. -->
-| — | MCP servers (Gitea repos) | See AI Stack §18000 | — | `mcp-comfyui`, `mcp-docling`, `mcp-shepard`, `mcp-upload-artifact` at `git.nuclide.systems/fkrebs/` |
+| — | MCP servers (Gitea repos) | See AI Stack §18000 | — | `mcp-comfyui`, `mcp-docling`, `mcp-upload-artifact` at `git.nuclide.systems/fkrebs/` (`mcp-shepard` decommissioned) |
 
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