docs: align operator docs with routes, sessions, and restore

Fix architecture route RBAC, restore Resync, and session/password wording;
correct guide restore/session/PTR claims and README port-587 text; point
the CSRF ADR at authz.go for global route gating.

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/security.md

@@ -198,7 +198,7 @@ domain-admin's browser sending a request still needs that domain-admin's own
 cookie, so a token would not add a boundary between roles that the
 authorization checks (`Principal.CanAccessDomain`,
 [internal/web/auth/principal.go](../internal/web/auth/principal.go); route
-gating in [internal/web/auth/middleware.go](../internal/web/auth/middleware.go))
+gating in [internal/web/handlers/authz.go](../internal/web/handlers/authz.go))
 don't already enforce. The remaining case is an external site making a
 logged-in user's browser send a request, which the origin check covers without
 touching a single template.