feat(helm): chart skeleton (Chart.yaml, values, helpers)

Initial scaffold for the ezscale-website chart. Defaults assume
self-contained local dev (in-cluster MariaDB + Valkey). Production
overrides will live in values-us-prod.yaml.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

helm/ezscale-website/.helmignore

@@ -0,0 +1,9 @@
+.DS_Store
+.git/
+.gitignore
+*.tmproj
+.vscode/
+*.swp
+*.tmp
+*.bak
+README.md.bak