Add Base rebalancer flow

[gianfra-t]

About

Rebalancer now checks by default the Base Nabla instance, for USDC -> BRLA rebalances.

If not specified otherwise, the flow compares between:

• Swapping with Avenia internally.
• Rebalancing using Squidrouter's selected pool for USDC -> BRLA on Polygon.
• Rebalancing using the "main" nabla DEX (Router: 0x58E5Cb2dA15f01CB8FAefef202aa25238efCBdcf).

This PR also adds rebalancing logic for the other direction, BRLA -> USDC. Only with the main nabla DEX path is included for now.

New commands and flags

--route=avenia or --route=squidrouter forces the path to one or the other regardless of the rate comparison.

New env variables

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[Copilot]

Pull request overview

Adds a new “USDC → BRLA → USDC” rebalancing flow targeting the Base Nabla instance by default, with optional routing via Avenia vs SquidRouter and resumable state persisted in Supabase storage.

Changes:

• Extend BRLA shared quote types/service to support specifying outputPaymentMethod for onchain swap quotes (e.g. Base).
• Introduce a new Base rebalancing flow (steps + orchestrator) and Base coverage-ratio check used by default (legacy flow preserved behind --legacy).
• Add shared Supabase-backed state manager abstraction and a simple EVM nonce manager for sequential tx submission.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
packages/shared/src/services/brla/types.ts	Extends onchain swap quote params to optionally specify output payment method.
packages/shared/src/services/brla/brlaApiService.ts	Uses optional output payment method when building onchain swap quote requests.
apps/rebalancer/src/utils/nonce.ts	Adds a nonce manager to issue sequential nonces for EVM transactions.
apps/rebalancer/src/utils/config.ts	Consolidates EVM executor secret usage and adds Base EVM client getter.
apps/rebalancer/src/services/stateManager.ts	Refactors state persistence into a reusable Supabase storage state manager; adds state for Base flow.
apps/rebalancer/src/services/indexer/index.ts	Adds Base Nabla BRLA pool coverage-ratio read via onchain calls.
apps/rebalancer/src/rebalance/usdc-brla-usdc-base/steps.ts	Implements Base rebalance step functions (Nabla swap, Avenia transfer/swap, Squid route swap).
apps/rebalancer/src/rebalance/usdc-brla-usdc-base/index.ts	Orchestrates the new Base flow with resumability and optional forced routing.
apps/rebalancer/src/rebalance/brla-to-axlusdc/index.ts	Updates legacy flow to use the renamed state manager and phase order constants.
apps/rebalancer/src/index.ts	Switches default run path to Base flow; adds --legacy and --route=... flags.
apps/rebalancer/README.md	Updates env var documentation for the new consolidated EVM secret and legacy-only Pendulum secret.
apps/rebalancer/.env.example	Updates example env vars for the new consolidated EVM secret and legacy-only Pendulum secret.

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[Copilot]

Pull request overview

Copilot reviewed 21 out of 21 changed files in this pull request and generated 5 comments.

[ebma]

I think some parts could be cleaner or refactored, like duplicate imports of the USDC token contract, or the ABI functions but it's also fine with me to leave as is since it's just the rebalancer. @gianfra-t what about the code-quality comments from the bot?