feat(routes-f): add binary-to-text converter and deep-merge objects

[Just-Bamford]

Description:

787. Binary-to-Text Converter

POST endpoint that converts text to space-separated binary and back.

• Handles UTF-8 multibyte characters (emoji support)
• Mode: to_binary | from_binary
• Configurable bit width (default: 8)
• Validates binary format and rejects malformed input with 400

789. Deep Merge Objects

POST endpoint that deep-merges multiple JSON objects with array strategy options.

• Merges 2+ objects with nested support
• Array strategies: replace (default) | concat | union
• 2MB request body size limit
• Full validation and error handling

Both features include comprehensive test coverage with edge cases.

this pr Closes #787
this pr Closes #789

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