(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.

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Deploying gmx-interface with    Cloudflare Pages

Latest commit:	fb08d36
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Branch Preview URL:	https://access-x-post.gmx-interface.pages.dev

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[qwinndev]

Superseded by #2491 with the renamed branch gmx-execution-costs.