[codex] Add multi-network TVL and contract ops

[prissca]

What changed

• Adds config-driven Testnet/Mainnet selection for the indexer and API via ?network=mainnet|testnet.
• Adds parsed asset and created amount fields to indexed events, a scheduled TVL aggregation cache, and GET /stats/tvl plus the Next.js /api/stats/tvl proxy.
• Removes the contract's storage-backed re-entrancy lock from claim and revoke, avoiding unnecessary instance storage writes in Soroban's single-invocation execution model.
• Extends contract operations scripts with build/optimize/deploy/cost/upload/upgrade flows and documents the 48-hour WASM hash upgrade procedure.
• Repairs a few small existing TypeScript issues surfaced by the build: missing imports and the duplicated createSchedule argument path.

Closes #229
Closes #213
Closes #209
Closes #230

Validation

• npm --prefix indexer run build passes.
• git diff --check passes.
• npm run build gets through app compilation, then fails because the root app does not install better-sqlite3 for notification API routes and root TypeScript includes sdk/tsup.config.ts without the SDK package's tsup dependency installed at the root.
• cargo test --manifest-path contracts/Cargo.toml and lefthook cargo_* checks could not run because cargo is not installed in this container.

Notes

• The root package-lock.json had pre-existing local churn and is intentionally not included in this PR.
• Mainnet indexing requires CONTRACT_ID_MAINNET to be configured before running a mainnet poller.

[drips-wave]

@prissca Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

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[libby-coder]

resolve please