docs: session continuity file + claude-max-bridge /v1/responses fix

- Add RESUME.md for cross-session continuity (open items, key state, constraints)
- claude-max-bridge: implement /v1/responses (OpenAI Responses API) with
  previous_response_id chaining via server-side history injection into system prompt.
  Root cause of "session already in use": CLI leaves JSONL in un-resumable
  "dequeued" state after each --print run; fix avoids session reuse entirely.
  Also fixed: assistant content must be array-of-blocks not plain string (silent
  JS crash otherwise).
- LiteLLM: add pass_through_endpoints for /v1/responses → claude-max-bridge
- Storage, volumes, architecture docs reconciled (Vaultwarden → local zfs,
  Pocket-ID backup, WAL-G fix, apps/ decommission, Nextcloud CIFS→NFS)
- Add ideas/, proxmox-memory-audit.md, llm-benchmark.md (new docs this session)

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

services/mcp-gateway.md

@@ -14,7 +14,7 @@ DinD MCP gateway on CT 104. Single OAuth-gated entry point fronting 24 MCP serve
 
 ## Server inventory (as of 2026-05-22)
 
-26 servers configured in `mcp-gateway/config.json`. **Status: 26 healthy, 1 disabled (nextcloud re-enabled 2026-05-22).**
+26 servers configured in `mcp-gateway/config.json`. **Status: 27 healthy.**
 
 | Group | Server | Kind | Notes |
 |---|---|---|---|
@@ -35,6 +35,7 @@ DinD MCP gateway on CT 104. Single OAuth-gated entry point fronting 24 MCP serve
 | | wikipedia-mcp | catalog | |
 | | youtube-transcript | catalog | `mcp/youtube-transcript` |
 | **personal** | bluesky | static | `ariel-mcp:8000` |
+| | obsidian | spawn | `mcp-obsidian-bridge` + mcpvault; vault at Nextcloud `fkrebs@nucli.de/files/Notizen` (UNAS mount) |
 | | gotify | spawn | |
 | | home-assistant | static | `http://192.168.1.60:9583/private_...` (HA add-on) |
 | | immich | spawn | |