[Governance] Create proposal entrypoint

[Kaylahray]

Description

The Governance contract defines proposal storage and vote execution flows, but it still needs a public proposal-creation entrypoint so proposals can be created on-chain without test-only storage seeding.

User Story

As a Protocol User,
I want to create a proposal through the contract,
so that governance state begins from an on-chain action rather than direct storage writes.

Requirements and Context

• Files: contracts/governance/src/lib.rs, contracts/governance/src/types.rs, contracts/governance/src/test.rs
• Add create_proposal(env: Env, proposer: Address, metadata_hash: BytesN<32>, end_time: u64) -> u32
• Require proposer.require_auth()
• Generate and persist a new proposal ID with zeroed vote counters and executed = false
• Add any additional storage key needed for proposal counting

Suggested Implementation

// IN FUNCTION: create_proposal(env: Env, proposer: Address, metadata_hash: BytesN<32>, end_time: u64) -> u32
// 1. proposer.require_auth();
// 2. let proposal_id = next stored counter value;
// 3. let proposal = Proposal { ... };
// 4. env.storage().persistent().set(&DataKey::Proposal(proposal_id), &proposal);
// 5. return proposal_id;

Acceptance Criteria

• Proposals can be created without writing storage directly in tests.
• Proposal IDs increment predictably.
• Newly created proposals are voteable and executable through existing governance flows.

Submission Guidelines

• Branch: feat/create-proposal
• Depends on: [Governance] Define proposal schema
• PR: feat(governance): add create_proposal entrypoint

[malaysiaonelove]

Hi maintain,I will love to work on this issue,I have an experience and I have already reviewed the issue please assigned me to it and I will give a good result.

[SaintSammi]

Hi Maintainer, I have read and understood what is required, please assign this issue to me. I can deliver an excellent job

[grantfox-oss]

🦊 GrantFox — @SaintSammi 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 #89)
2. Your PR will be reviewed by the learnault 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!

@SaintSammi's PR #104 was approved and merged by @Kaylahray.

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👏 Great work, @SaintSammi! Keep contributing to learnault.