fix: soft-fail on insufficient stake & auto-update height via API

[martinconic]

Checklist

• I have read the coding guide.
• My change requires a documentation update, and I have done it.
• I have added tests to cover my changes.
• I have filled out the description and linked the related issues.

Description

1. On startup, if the node has insufficient stake for the configured ReserveCapacityDoubling, it now logs a warning and skips the on-chain UpdateHeight transaction instead of crashing or reverting. The node starts with the increased local capacity but without redistribution rewards.
2. When a user deposits stake via the POST /stake/deposit endpoint, the handler now automatically triggers the UpdateHeight transaction upon success. This allows a "soft-failed" node to seamlessly upgrade its on-chain status without a restart.

Open API Spec Version Changes (if applicable)

Motivation and Context (Optional)

Related Issue (Optional)

Screenshots (if appropriate):

[gacevicljubisa]

Instead of polling every 10 minutes, we should trigger UpdateHeight directly from stakingDepositHandler after a successful DepositStake. Staking can only happen via the API POST /stake/deposit/{amount}, so we already know exactly when the stake changes — there's no need to poll the chain for something we initiated ourselves.

The only case polling would cover is if someone stakes directly on the smart contract bypassing the bee API, but that's not a supported workflow.

[gacevicljubisa]

PR desc says that node crashes, is it really the case?