[WIP] Use 'DApps' instead of 'dApp' for consistency with standard blockchain terminology.

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Use 'DApps' instead of 'dApp' for consistency with standard blockchain terminology.</issue_title>
<issue_description>Use 'DApps' instead of 'dApp' for consistency with standard blockchain terminology.

// Fork mainnet for realistic testing - test your DApps against real DEXs!

Originally posted by @copilot-pull-request-reviewer in joe10832/onchaintestkit#2 (comment)</issue_description>

<agent_instructions>@copilot<issue_title>copilot-setup-steps</issue_title>
<issue_description>/.github/copilot-instructions.md
/.github/instructions/**/*.instructions.md
**/AGENTS.md
/CLAUDE.md
/GEMINI.md</issue_description>@</agent_instructions>

Comments on the Issue (you are @copilot in this section)

Fixes #10

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[joe10832]

copilot/fix-66cd4842-b399-4c9f-ae6c-0b78d9aa5c0b