[APPLICATION][GATEWAY] 0 Balance Appstake causes entire Gateway to Fail

[fredteumer]

Objective

Ensure that the gateway can still operate and pass an error when any singular appstake fails

Origin Document

On 2025-10-19 the Grove Gateway went offline for several hours due to two appstakes running out of staked balance.

Goals

• Ensure the PATH binary does not fail when an appstake has 0 balance
• Return meaningful logs instead that provide the user with instructions on how to remedy.

Deliverables

• Bug Fix
• Error state and Error message

Non-goals / Non-deliverables

• Automation of staking balances or appstakes management

General deliverables

• Comments: Add/update TODOs and comments alongside the source code so it is easier to follow.
• Testing: Add new tests (unit and/or E2E) to the test suite.
• Makefile: Add new targets to the Makefile to make the new functionality easier to use.
• Documentation: Update architectural or development READMEs; use mermaid diagrams where appropriate.

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Creator: @fredteumer