Security patch: Add json.loads on bytes and use errors = replace

[bitterpanda63]

Summary by Aikido

Security Issues: 0	Quality Issues: 0	Resolved Issues: 0

⚡ Enhancements

• Attempted JSON parsing on byte bodies and used replacement decoding.
• Changed path byte decoding to use utf-8 with replacement characters.
• Passed raw request body bytes to context instead of pre-decoding.

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