Hide live controls from public switch page

[Pigbibi]

Summary

• replace public fallback account data with non-sensitive platform placeholders
• hide account, strategy, mode, run controls, and summary unless private config is loaded after login
• add Worker regression checks for public page and unauthenticated config response

Tests

• jq empty web/strategy-switch-console/account-options.example.json web/strategy-switch-console/strategy-profiles.example.json
• node --experimental-default-type=module tests/strategy_switch_worker_validation.mjs
• sed -n '/<script>/,/</script>/p' web/strategy-switch-console/index.html | sed '1d;' | node --check --input-type=commonjs
• node --check --input-type=module < web/strategy-switch-console/page_asset.js
• node --check --input-type=module < web/strategy-switch-console/worker.js
• python3 scripts/runtime_settings.py validate
• python3 -m unittest discover -s tests -v
• git diff --check