Reorganize docs by project and archive legacy context files

projects/shared/ARCHITECTURE.md

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+# Shared Architecture
+
+## Request flow
+
+1. User searches on SearXNG.
+2. Custom engines query SethSearch API (`json_engine`).
+3. SethSearch reads SQLite FTS5 index and applies source-specific scoring.
+4. SearXNG merges with other web engines and renders response.
+
+## Data model
+
+- DB: `/opt/sethsearch/articles.db`
+- Main table: `documents`
+- FTS table: `documents_fts`
+
+## Reliability pattern
+
+- Source sync jobs run independently.
+- Failures in one source do not block other source updates.
+- systemd restart policy keeps service resilient.

projects/shared/OPERATIONS.md

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+# Shared Operations
+
+## SearXNG checks
+
+- Status: `ssh pve173 "pct exec 119 -- systemctl status searxng --no-pager"`
+- Logs: `ssh pve173 "pct exec 119 -- journalctl -u searxng -n 100 --no-pager"`
+
+## SethSearch checks
+
+- Status: `ssh pve173 "pct exec 620 -- systemctl status sethsearch --no-pager"`
+- Logs: `ssh pve173 "pct exec 620 -- journalctl -u sethsearch -n 100 --no-pager"`
+- Stats: `curl -s "https://sethsearch.sethpc.xyz/stats"`
+
+## Caddy checks
+
+- Validate: `ssh pve241 "pct exec 600 -- caddy validate --config /etc/caddy/Caddyfile"`