Add comprehensive test coverage for pallet-robonomics-rws v2.0 auction lifecycle

[Copilot]

PR #381 refactored the RWS pallet to a two-phase auction system (bid → claim) with static auction scheme, but lacked test coverage. This PR adds 24 tests covering auction lifecycle, subscriptions, and failure modes.

Changes

Test Infrastructure

• Updated mock runtime to current Substrate patterns (RuntimeOrigin, RuntimeCall, RuntimeEvent)
• Configured test dependencies (Balances, Timestamp only - no external pallet dependencies)
• Enabled previously commented-out test module

Test Coverage (24 tests)

Auction Lifecycle

• Start auctions with lifetime/daily subscription modes
• Multiple concurrent auctions

Bidding

• First bid becomes winner, outbidding mechanics
• Validation: minimum bid, non-existent auction, expired period

Claiming

• Successful claim by winner post-auction
• Beneficiary assignment (claim to different account)
• Validation: early claim, non-winner, double claim

Subscription Usage

• RWS calls with lifetime/daily subscriptions (using pallet_balances::Call::transfer_allow_death as mock transactions)
• Free weight accumulation via formula: ReferenceCallWeight × uTPS × delta_ms / 1_000_000_000
• Validation: insufficient weight, expired subscription, non-existent subscription

Edge Cases

• Insufficient balance, expiration boundaries, weight calculation accuracy, multiple subscriptions per user

Example Test

#[test]
fn test_bid_outbidding() {
    new_test_ext().execute_with(|| {
        assert_ok!(RWS::start_auction(RuntimeOrigin::root(), SubscriptionMode::Lifetime { tps: 50_000 }));
        
        // Alice bids first
        assert_ok!(RWS::bid(RuntimeOrigin::signed(ALICE), 0, 200));
        assert_eq!(Balances::reserved_balance(ALICE), 200);
        
        // Bob outbids Alice
        assert_ok!(RWS::bid(RuntimeOrigin::signed(BOB), 0, 300));
        
        // Alice's reserve unreserved, Bob's reserved
        assert_eq!(Balances::reserved_balance(ALICE), 0);
        assert_eq!(Balances::reserved_balance(BOB), 300);
    });
}

All tests pass. No clippy warnings in test code.

Original prompt

Check #381 and add tests into pallet-robonomics-rws that covers all functionality. Focus on auction life cycle, subscriptions and fail cases. You can use pallet-balances for mock transactions.

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[akru]

@copilot Don't use pallet-robonomics-datalog here, please cleanup all mentions.

[Copilot]

@copilot Don't use pallet-robonomics-datalog here, please cleanup all mentions.

Removed all pallet-robonomics-datalog references. Tests now use pallet-balances::Call::transfer_allow_death for RWS subscription testing. All 24 tests still pass. (0de7d36)