Add more loan record status

[Kailai-Wang]

Context

This is a big refactoring to the current impl:

• it introduces various LoanState which will be updated after each action
• it tries to use a waterfall pattern to be able to resume from any state where it was left off (like state machine).
• it improves the readability by separating the logic into smaller functions and outlining the flow in the main handler
• it adds two test rpcs for easier debugging of position opening and closing:
  • openPositionTest
  • closePositionTest

Please beware of the rpc parameter change and struct change, examples:

• no client_id in any of the RPCs
• an optional loan_nonce in requestLoanTest - if we wish to resume from some intermediate state of a specific loan, pass in that loan nonce, for fresh new loans you either leave it out or use the same nonce as in the userop
• to_perp_move_tx_hash is added into requestLoan response
• the LoanRecord struct change

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Project	Deployment	Preview	Comments	Updated (UTC)
heima	Ready	Preview	Comment	Oct 31, 2025 11:30pm
heima-aa-demo-app	Ready	Preview	Comment	Oct 31, 2025 11:30pm

[claude]

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