Fix DCA workflow dispatch inputs

[Pigbibi]

Summary

• keep Manual Strategy Switch under the GitHub workflow_dispatch input limit
• route DCA controls through extra_variables_json control fields and translate them to runtime variables
• add tests for DCA JSON controls and workflow input count

Tests

• python3 -m unittest tests.test_runtime_settings
• node --experimental-default-type=module tests/strategy_switch_worker_validation.mjs
• node --check --input-type=module < web/strategy-switch-console/worker.js
• node --check --input-type=module < web/strategy-switch-console/page_asset.js
• node --check --input-type=module < web/strategy-switch-console/strategy_profiles_asset.js
• extracted index.html script checked with node --check
• DCA build_runtime_switch smart/fixed validation commands
• git diff --check

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 7178a06fcc

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[chatgpt-codex-connector]

Validate JSON DCA controls before dispatch

When callers use the new extra_variables_json route for DCA controls, this sanitizing helper drops invalid values instead of preserving that a control field was supplied; for example {"dca_mode":"smart","dca_base_investment_usd":"0"} on a DCA profile passes normalizeSwitchInputs and gets dispatched, but build_runtime_switch.py later rejects the same payload. Please validate the raw dca_mode/dca_base_investment_usd JSON fields here so the switch API fails synchronously instead of creating a workflow run that fails after dispatch.

Useful? React with 👍 / 👎.