docs(foundry): add the remappings the mocks need to compile

[devorun]

The foundry.toml on the Foundry docs page doesn't compile a test that inherits CofheTest. Two remappings are missing:

• @openzeppelin/contracts-upgradeable/: the 1.0 mocks import it (Permissioned.sol, ACPShareRegistry.sol). feat: share metadata labels and the pointer-based share registry #389 added it to the plugin README but not to the docs page. Without it forge stops with Source "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol" not found.
• hardhat/: MockCoFHE.sol imports hardhat/console.sol, which a Foundry project doesn't have. The plugin's own foundry.toml and cofhe-foundry-starter map it to forge-std's console.sol (hardhat/=node_modules/forge-std/src/). Without it the build fails with Source "hardhat/console.sol" not found. The plugin README is missing this one too.

I added both to the docs page and hardhat/ to the README. To check, I set up a project with the packages under node_modules and the docs quick-start test (deployMocks(), createCofheClient(), connect()). With the current remappings it fails on each missing source in turn. With these changes it builds and the test passes, using either the docs page's remappings or the README's.

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[architect-dev]

Thanks for the fix!