refactor: wire Open WebUI → Kiro Gateway + mcpo, add Reltio Forge spec

- docker-compose: 3 services (gateway, mcpo, webui) with proper wiring
- Open WebUI connects to Kiro Gateway for LLM, mcpo for MCP tools
- TOOL_SERVER_CONNECTIONS auto-discovers Jira, Aha, Context7
- Simplified mcporter.json (env vars from container, not JSON)
- env.example consolidated with all keys
- SETUP.md rewritten with architecture diagram
- Pipelines deprecated (mcpo replaces custom Python shims)
- Added docs/reltio-forge.md

openwebui/pipelines/DEPRECATED.md

@@ -0,0 +1,8 @@
+# ⚠️ DEPRECATED — Use mcpo instead
+
+These pipeline files are no longer needed. Open WebUI now connects to MCP servers
+directly via mcpo and `TOOL_SERVER_CONNECTIONS`.
+
+See `openwebui/SETUP.md` for the current architecture.
+
+These files are kept for reference only and will be removed in a future cleanup.