docs: fee policy, profiling, and transaction kit guides

[MuncleUscles]

Adds a small fee-policy docs section for app and tool developers.

What changed:

• keeps an overview page for fees and transaction policy
• adds a dedicated Transaction Kit Integration page
• adds a dedicated Fee Profiling and Estimation page
• adds a dedicated Fee Outcomes and Debugging page
• makes clear that fee profiling is not transaction-kit-specific: JS, Python, CLI/backend tools can use the same profile values
• documents method aggregation semantics: multiple tests for the same method collapse to per-field maxima across measured branches, with headroom applied
• includes examples for transaction-kit, genlayer-js, genlayer-py, and GenLayer CLI usage

Validation:

• npm run build

This remains draft/release-gated until the fee train docs should publish.

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📝 Walkthrough

Walkthrough

This PR adds documentation for GenLayer's fee model and transaction kit integration. A metadata entry registers the new page in the navigation structure, and a comprehensive MDX documentation file covers fee estimation, kit setup with React/Vue or headless flows, fee profiling with gltest, outcome/status mapping, and Explorer-based debugging.

Changes

Fees & Transaction Kit Documentation

Layer / File(s)	Summary
Navigation registration and fees documentation pages/developers/decentralized-applications/_meta.json, pages/developers/decentralized-applications/fees-and-transaction-kit.mdx	Navigation entry registers the new "Fees & Transaction Kit" documentation page. Complete MDX guide covers v0.6 fee model, fee deposit and refund mechanics, developer integration steps (install, kit creation, UI panel or headless usage, fee profiling), gltest toolchain guidance, outcome/status user mapping, and Explorer-based debugging workflow.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

A kit for fees, so clear and bright,
With panels glowing left and right,
Your transactions flow with grace,
No hand-rolled math to clutter space. 🐰✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title 'docs: fee policy, profiling, and transaction kit guides' clearly and specifically summarizes the main changes: adding documentation for fees, profiling, and transaction kit integration.
Description check	✅ Passed	The PR description is complete and follows the template structure, including detailed 'What changed' section with specific files/pages added, clear explanation of key changes, and validation confirmation.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/fees-transaction-kit

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