restore contract metadata

[camembera]

This PR reintroduces a single source of truth for contract addresses and makes deployed-contract docs generated output instead of hand-maintained tables. It also tightens the workflow so stale generated files are caught before commit.

• add data/contracts.json as canonical contract data source and generate contract snippets/pages from it
• move generated snippet outputs under snippets/contracts/generated/ and update deployed-contract pages to import from generated snippets
• backfill data/contracts.json from old constants.json
• render network sections conditionally so empty networks do not emit headings/tables
• add a generator with a --check mode to contracts generator so stale outputs fail with non-zero exit
• add repo pre-commit hook + installer to run generator check
• document generation/check-in expectations in CONTRIBUTING.md

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Project	Deployment	Actions	Updated (UTC)
berachain-docs-bex	Error		Feb 26, 2026 5:45pm
docs-bend	Error		Feb 26, 2026 5:45pm