[Contracts] Add transfer_admin so protocol ownership can be rotated

[ogazboiz]

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Why this matters

The protocol admin is set once in initialize and is then immutable forever. update_fee_config keeps the existing admin (admin: config.admin) and there is no other entry point that can change it. If the admin key is lost, rotated, or compromised, the protocol can never recover control of the treasury/fee configuration — a serious operational risk for anything heading to mainnet. A standard, authenticated two-field (or two-step) admin transfer closes this gap.

Acceptance criteria

• Add a transfer_admin(env, current_admin, new_admin) function to contracts/stream_contract/src/lib.rs that requires the current admin's auth, verifies the caller matches the stored admin, and updates ProtocolConfig.admin.
• Emit an AdminTransferredEvent (contracts/stream_contract/src/events.rs).
• Reject when the contract is not initialized (NotInitialized) and when the caller is not the admin (NotAdmin).
• Add unit tests in contracts/stream_contract/src/test.rs: successful transfer, non-admin rejected, and the new admin can subsequently call update_fee_config.

Files to touch

• contracts/stream_contract/src/lib.rs
• contracts/stream_contract/src/events.rs
• contracts/stream_contract/src/test.rs

Out of scope

• A timelock or multisig admin model (can be layered later).

[emdevelopa]

@emdevelopa has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hiii maintainer i'd like to jump on this issue

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