docs: add cloudflare pages, cache rules docs and fix relative links

docs/architecture/README.md

@@ -669,7 +669,7 @@ Security is split between edge controls (Cloudflare), reverse proxy controls (ng
 #### Transport and Edge Protection
 
 - Public traffic uses HTTPS/WSS at the edge.
-- Cloudflare WAF and rate limiting are part of the baseline (see `infrastructure/cloudflare/cache-rules.md`).
+- Cloudflare WAF and rate limiting are part of the baseline (see [cache-rules](../docs/infrastructure/cloudflare/cache-rules.md)).
 - Cloudflare Worker can enforce immutable cache headers for segment paths (`infrastructure/cloudflare/worker.js`).
 
 #### Reverse Proxy Enforcement (nginx)