[CT-07] Implement maintenance record creation in asset-maintenance in opsce crate

[yusuftomilola]

Problem

contracts/asset-maintenance/src/lib.rs defines the MaintenanceRecord type and related enums but the function to actually create and store a maintenance record on-chain is missing or incomplete.

Proposed Solution

Create contracts/opsce/src/maintenance_record.rs. Implement create_maintenance_record(env, asset_id, record_type, provider, scheduled_date, cost, notes) that stores a MaintenanceRecord in the ledger.

Acceptance Criteria

• create_maintenance_record() validates that asset_id is non-empty and cost is non-negative
• Generates a unique record_id (hash of asset_id + timestamp)
• Stores the record under key DataKey::MaintenanceRecord(record_id)
• get_maintenance_records(env, asset_id) returns all records for a given asset as a Vec
• MaintenanceStatus enum: Scheduled, InProgress, Completed, Cancelled
• Emits a maintenance_scheduled event on creation
• Unit tests cover: create, retrieve, and duplicate prevention

[ayshadogo]

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

Hello maintainer

I would like to handle this Please

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