[INLONG-1102][Doc] Fix Development And SDK Chapter

[Jzow]

Fixes #1102

Motivation

1. Under standard specifications, document code needs to be formatted and code block highlighting
2. Modified incorrect c++ code and added code block labels

Modifications

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Verifying this change

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• This change is a trivial rework/code cleanup without any test coverage.

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  • Added integration tests for end-to-end deployment with large payloads (10MB)
  • Extended integration test for recovery after broker failure

Documentation

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