feat: add auth mode none for testing (no auth required)

- Add AuthMode::None variant for disassembly/testing
- Returns synthetic JWT claims when auth disabled
- Set MEM_AUTH_MODE=none in config for dev/test
- Allows full API access without Authentik OIDC

k8s/app/config.yaml

@@ -10,7 +10,7 @@ metadata:
     app.kubernetes.io/component: config
 data:
   # Auth mode: jwt | apikey
-  MEM_AUTH_MODE: "jwt"
+  MEM_AUTH_MODE: "none"
   # Rate limiting
   MEM_RATE_LIMIT_INGEST: "100"
   MEM_RATE_LIMIT_QUERY: "1000"