chore: remove dev-mode

[sbackend123]

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

PR removes dev-mode support from Bee by deleting the bee dev command, dev-only node initialization, special API branches, and related tests and documentation. After this change, the codebase only keeps the supported runtime modes: light, full, and ultra-light.

Open API Spec Version Changes (if applicable)

Change in /status/peers contract:

The OpenAPI contract no longer includes beeMode=dev, so formally the /status/peers response no longer allows that value. In practice, this should not break anything, because dev-mode should never appear for real peers in production networks.

Motivation and Context (Optional)

Related Issue (Optional)

Screenshots (if appropriate):

AI Disclosure

• This PR contains code that has been generated by an LLM.
• I have reviewed the AI generated code thoroughly.
• I possess the technical expertise to responsibly review the code generated in this PR.

[akrem-chabchoub]

@Cafe137 just for your input, that this later may affect swarm-cli and bee-js