(test-only) GMX execution cost research page

[qwinndev]

Summary

• Adds a dev-only GMX BTC execution-cost research page at #/gmx-execution-costs.
• Adds scripts to fetch/regenerate GMX execution cost datasets and app/report data.
• Includes 90d / 30d / 7d / 1d BTC datasets with protocol-cost math including swap cost.
• Uses existing app dropdown, sorter, and pagination components for the research UI.

Notes

• Route and lazy import are gated behind import.meta.env.DEV.
• Holding fees are reported separately and excluded from protocol cost.
• Exact delay drift is not modeled because order-created oracle mid data is unavailable.

Validation

• node_modules/.bin/eslint src/pages/GmxExecutionCosts/GmxExecutionCosts.tsx src/App/MainRoutes.tsx src/context/SorterContext/types.ts src/context/SorterContext/SorterContextProvider.tsx --max-warnings=0
• yarn tsc -p tsconfig.json --noEmit --pretty false
• Browser checks for dropdowns, table sorting/pagination, and column alignment.
• Pre-push checks passed.

[cloudflare-workers-and-pages]

Deploying gmx-interface-home with    Cloudflare Pages

Latest commit:	dcb80a5
Status:	✅  Deploy successful!
Preview URL:	https://7b1738fa.gmx-interface-home.pages.dev
Branch Preview URL:	https://gmx-execution-costs.gmx-interface-home.pages.dev

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[cloudflare-workers-and-pages]

Deploying gmx-interface with    Cloudflare Pages

Latest commit:	dcb80a5
Status:	✅  Deploy successful!
Preview URL:	https://84e5616d.gmx-interface.pages.dev
Branch Preview URL:	https://gmx-execution-costs.gmx-interface.pages.dev

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[github-actions]

Playwright Component Test Report

All tests passed.

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_{Commit dcb80a5}

[qwinndev]

Combined into #2556.