Title: perf(contracts): optimize contract gas usage and establish benchmarks`

[Divineifed1]

Description:
Soroban transaction fees are paid in XLM (stroops). Each contract function must be profiled for instruction count and ledger entry usage to keep user costs predictable and low.

Acceptance criteria:

• Benchmark script measures CPU and memory for each public function (cargo test --release)
• Results stored in docs/gas-benchmarks.md with target and actual values
• get_count and get_bet optimized to use temporary storage where safe
• Excessive vec! allocations identified and replaced with streamed iteration where possible
• CI fails if any function exceeds defined gas budget (configurable threshold)

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[OpensrcLord]

Hello @maintainer, I’ve gone through the requirements and I’m confident I can implement a proper solution that matches the acceptance criteria. Kindly assign this issue to me. And I will deliver at the shortest possible time.

[mftee]

Hey maintainer. I have a proven track record and already understand the codebase and how to implement this issue without obstacles.

[grantfox-oss]

🦊 GrantFox — @mftee has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #23)
2. Your PR will be reviewed by the Exquisitech maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign | FWC26 campaign!

@mftee's PR #31 was approved and merged by @Divineifed1.

🏆 @mftee: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (869 total points). Track your full progress on GrantFox.

👏 Great work, @mftee! Keep contributing to Exquisitech.