Add SearchXNG and SethSearch project context docs

README.md

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+# SearchXNG Project
+
+Unified workspace for:
+
+- `searchxng/`: SearXNG settings, engine wiring, and instance branding context.
+- `api/`: SethSearch API context, indexing rules, and source integration details.
+- `context/`: operational runbooks and architecture docs.
+
+## Stack
+
+- SearXNG instance: `searxng.sethpc.xyz` / `search.sethpc.xyz` (CT 119 on `pve173`)
+- SethSearch API: `sethsearch.sethpc.xyz` (CT 620 on `pve173`)
+- Reverse proxy: Caddy CT 600 (`pve241`)
+
+## Key behavior
+
+- `sethsearch` engine (general): searches homelab/site/content sources with strict FreshRSS and strict Emby matching.
+- `sethflix` engine (videos): Emby-only search for media discovery.
+- LibreTranslate integrated via `translate.sethpc.xyz`.
+
+## Quick Ops
+
+- Restart SethSearch API:
+  - `ssh pve173 "pct exec 620 -- systemctl restart sethsearch"`
+- Restart SearXNG:
+  - `ssh pve173 "pct exec 119 -- systemctl restart searxng"`
+- Validate Caddy:
+  - `ssh pve241 "pct exec 600 -- caddy validate --config /etc/caddy/Caddyfile"`