docs: update pooled staking product documentation and add roles, perm…

[loga4]

update pooled staking product documentation and add roles, permissions, and withdrawal operations guides

[arwer13]

Good start, I've proposed a few additions. And let's do AI review for language / formatting.

[Copilot]

Pull request overview

This PR refreshes and extends the stVaults pooled staking (DeFi Wrapper) documentation, adding new operational guides and aligning links/structure across the docs set.

Changes:

• Reworked the main stVaults and Building Guides index tables to point to the pooled staking product as a directory and improved formatting.
• Expanded the pooled staking product guide with corrected links, an explicit section on DeFi Wrapper roles/permissions, and references to new sub-guides.
• Added three new in-depth guides for pooled staking products: withdrawals operations, DeFi Wrapper roles and permissions, and building pools with custom strategies (including upgrade flows).

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
run-on-lido/stvaults/index.md	Updates the “Building Guides” table formatting and links to the pooled staking product folder, helping users discover the new sub-guides.
run-on-lido/stvaults/building-guides/index.md	Mirrors the improved product table and directory link for the two main staking product archetypes.
run-on-lido/stvaults/building-guides/pooled-staking-product/index.md	Adjusts strategy description text, fixes multiple relative links (tiers, PDG, metrics, health guides), and adds pointers to the new roles/permissions and withdrawals docs.
run-on-lido/stvaults/building-guides/pooled-staking-product/withdrawals.md	New operational guide detailing how to monitor the withdrawal queue, manage liquidity from validators, finalize requests, and configure gas cost coverage.
run-on-lido/stvaults/building-guides/pooled-staking-product/roles-and-permissions.md	New reference describing DeFi Wrapper governance, pool/queue/distributor roles, and how wrapper permissions are wired into the stVault Dashboard.
run-on-lido/stvaults/building-guides/pooled-staking-product/custom-strategy.md	New end-to-end guide for deploying a pool with a custom strategy and upgrading an existing pool to a strategy pool, including CLI/Foundry examples and reference implementations.

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