staking: migrate from discovery and fix prod runtime + build issues

[dylanjeffers]

Summary

Migrates the staking service from apps/packages/discovery-provider/plugins/pedalboard/apps/staking to this repo at parity, and fixes a set of issues that would have prevented it from running correctly in prod:

• ClaimsManager runtime bug — @audius/eth 1.0.0 changed ClaimsManager from a class to a plain { abi, address } object, so new ClaimsManager(viemClient) was a runtime crash. Bump the dep from 0.1.0 → 1.0.0 and rewrite initRound to use viemClient.readContract({ abi, address, functionName }). The three on-chain reads now run in parallel.
• Build setup — replace start: npx tsx ./src/index.ts with build: tsc + start: node ./dist/index.js, matching the anti-abuse-oracle pattern. The Dockerfile already runs npm run build during install, so the dev toolchain was being dragged into prod for no reason.
• Health endpoint — GET /health now returns the standard { status: 'ok' } shape used by the other pedalboard services.
• Port — pin to 6000 (matches the nginx /plugins/<service>/... upstream) and drop the process.env.port fallback that no caller was setting.

Git history

History preserved — git log --follow apps/staking/src/index.ts shows the original 3 commits from the discovery plugin (Add staking plugin to replace other system checks, Update default staking health check plugin port, Add verified-notifications).

Source-of-truth comparison

Diffed against apps/packages/discovery-provider/plugins/pedalboard/apps/staking — only difference was that discovery uses a local logger.ts (because @pedalboard/logger inside discovery's monorepo only exports log). This repo's @pedalboard/logger already exports createLogger, so no local logger is needed.

Paired PR

Pairs with AudiusProject/apps#14375, which adds the missing env_file and environment: blocks to the staking entry in dev-tools/compose/docker-compose.pedalboard.prod.yml so solana_rpc_endpoint and eth_rpc_endpoint actually reach the container. Until that lands, the service will boot but every Eth/Solana read will fail.

Test plan

• npm run build succeeds (tsc clean)
• npm run lint clean (only pre-existing non-null assertion warnings unchanged by this PR)
• Deploy to a single discovery node and hit /plugins/staking/health — expect { status: 'ok' }
• Hit /plugins/staking/init-round with valid eth_rpc_endpoint — expect 200 with lastFundedBlockNumber, latestBlock, fundingRoundBlockDiff, blockDiff
• Hit /plugins/staking/balance?chain=eth&address=0x… — expect 200 with formatted balance
• Hit /plugins/staking/balance?chain=solana&address=… — expect 200 with sol balance
• Verify apps/packages/discovery-provider/plugins/pedalboard/apps/staking can be removed in a follow-up after this deploys cleanly

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