Reorganize docs by project and archive legacy context files

projects/sethsearch-api/CONTEXT.md

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+# Project: SethSearch API
+
+## Purpose
+
+Provide a unified `json_engine` backend for SearXNG with source-aware matching and weighting.
+
+## Deployment
+
+- Container: CT `620` on `pve173`
+- Service URL: `https://sethsearch.sethpc.xyz`
+- Service name: `sethsearch`
+- Code path: `/opt/sethsearch/sethsearch.py`
+- Config path: `/opt/sethsearch/config.json`
+
+## Source groups
+
+- `source=general`: sites, gitea, wikijs, wordpress, freshrss, emby (strict emby/freshrss)
+- `source=sethflix`: emby-only (liberal media matching)
+
+## Indexed sources
+
+- Caddy domains (`sites`)
+- Gitea public repos (`gitea`)
+- Wiki.js public pages/fallback (`wikijs`)
+- WordPress public pages/posts (`wordpress`)
+- Emby media catalog (`emby`)
+- FreshRSS feed items (`freshrss`)