fix(polymarket-bot): remove cert-manager managed TLS secret from repo

ArgoCD was overwriting the polymarket-tls secret with REDACTED values,
corrupting the TLS cert. This secret is managed by cert-manager and
must not be tracked in git.

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

polymarket-bot/secret-polymarket-tls.yaml

@@ -1,21 +0,0 @@
-apiVersion: v1
-data:
-  tls.crt: REDACTED
-  tls.key: REDACTED
-kind: Secret
-metadata:
-  annotations:
-    cert-manager.io/alt-names: polymarket.chemavx.xyz
-    cert-manager.io/certificate-name: polymarket-tls
-    cert-manager.io/common-name: polymarket.chemavx.xyz
-    cert-manager.io/ip-sans: ''
-    cert-manager.io/issuer-group: cert-manager.io
-    cert-manager.io/issuer-kind: ClusterIssuer
-    cert-manager.io/issuer-name: letsencrypt-prod
-    cert-manager.io/uri-sans: ''
-  labels:
-    controller.cert-manager.io/fao: 'true'
-  name: polymarket-tls
-  namespace: polymarket-bot
-type: kubernetes.io/tls
-