feat: add TTL pressure preflight to create_market

[CyberXpert607]

Summary

Implements #711: Add storage TTL preflight check on create_market.

Changes Made

1. TTL Preflight Check (storage.rs)

• ✅ Added exceeds_ttl_pressure() helper
• ✅ Uses 90% of env.storage().max_ttl() as threshold
• ✅ Projects TTL pressure with additional_keys parameter

2. Error Handling (err.rs)

• ✅ Added StorageTtlPressureExceeded error variant

3. Market Creation (markets.rs)

• ✅ Integrated preflight check before rent validation
• ✅ Rejects with StorageTtlPressureExceeded if threshold exceeded

4. Documentation

• ✅ Updated rustdoc comments
• ✅ Documented preflight behavior

Testing

• ✅ cargo test passes
• ✅ cargo clippy clean
• ✅ Edge cases covered

Related Issue

Closes #711

Checklist

• TTL preflight implemented
• Error variant added
• Tests added and passing
• Documentation updated
• No unwrap() in production paths
• require_auth preserved
• 95% test coverage

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