feat(waf): Phase 1 — Migration + Service + Handler — v1.2.66

- Migration 0037: waf_configs-Tabelle (domain_id FK, enabled=false default,
  mode/paranoia_level/rule_exclusions/trusted_proxies/custom_rules)
- models/waf.go: WafConfig-Model
- services/waf/waf.go: Repo (List, GetByDomain, Upsert, ListEnabled)
- handlers/waf.go: GET /waf/configs, GET /waf/configs/:id, PUT /waf/configs/:id
  — GET liefert Default-Config (disabled) wenn noch kein Row existiert
- main.go: WafHandler registriert

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

VERSION

@@ -1 +1 @@
-1.2.65
+1.2.66