Add a protocol status endpoint returning global trading pause state and protocol configuration

[Chucks1093]

Summary

The client needs a single endpoint to check whether global trading is paused and retrieve protocol-wide config values. A GET /protocol/status endpoint reading from the get_protocol_status contract view function should be added.

Scope

• Add GET /protocol/status endpoint (no auth required)
• Call the get_protocol_status contract view function and return globalTradingPaused, protocolFeeBps, treasuryAddress, lockupDurationSeconds, and minInvestmentAmount
• Cache the response in Redis for 30 seconds
• Invalidate the cache when an admin updates any protocol config value
• Return the pausedAt timestamp from the database when globalTradingPaused is true

Acceptance Criteria

• All required fields returned correctly
• globalTradingPaused reflects current contract state
• pausedAt included in response when paused
• Redis cache served within 30-second TTL
• Cache invalidated on any protocol config update

ETA: 12 hours

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Coordinate on Telegram

[codewithzubair07]

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i would like to work on this issue

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[Akinloluwa20]

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I would like to work on this issue

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[jajafwangshak86-ops]

@jajafwangshak86-ops has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

can I work on this please

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