feat: seed initial bond allowances in BondTreasuryPaymaster constructor

[aliXsed]

Summary

Add initialBondAllowances[] constructor parameter to BondTreasuryPaymaster, parallel to the existing initialWhitelistedUsers[]. Each whitelisted user now receives a non-zero userBondAllowance at deploy time, eliminating the need for a separate setUserBondAllowance transaction after deployment.

Problem

Previously, the constructor whitelisted users but left their userBondAllowance at zero. A separate admin call to setUserBondAllowance() was required before any sponsored claims could work. This was both easy to forget and created a window where the user was whitelisted but unable to use sponsored bonds.

Changes

• BondTreasuryPaymaster.sol: New uint256[] memory initialBondAllowances constructor arg (must match initialWhitelistedUsers length, enforced by ArrayLengthMismatch error). Allowances are set in the same loop that seeds the whitelist.
• DeploySwarmUpgradeableZkSync.s.sol: Reads FLEET_OPERATOR_BOND_ALLOWANCE env var (defaults to BOND_QUOTA) and passes it to the constructor.
• deploy_swarm_contracts_zksync.sh: Exports FLEET_OPERATOR_BOND_ALLOWANCE (defaults to BOND_QUOTA).
• Tests: 6 new tests covering constructor-set allowances, array length mismatch reverts, zero-allowance edge case, and immediate usability post-deploy. All 83 tests pass.

Testing

forge test --match-path test/paymasters/BondTreasuryPaymaster.t.sol
# 83 tests passed, 0 failed

[github-actions]

LCOV of commit 00c7f07 during checks #653

Summary coverage rate:
  lines......: 31.9% (771 of 2420 lines)
  functions..: 27.9% (105 of 377 functions)
  branches...: 37.5% (140 of 373 branches)

Files changed coverage rate:
                                                  |Lines       |Functions  |Branches    
  Filename                                        |Rate     Num|Rate    Num|Rate     Num
  ======================================================================================
  script/DeploySwarmUpgradeableZkSync.s.sol       | 0.0%     68| 0.0%     1|    -      0
  src/paymasters/BondTreasuryPaymaster.sol        | 0.0%     44| 0.0%     5| 0.0%      9
  test/paymasters/BondTreasuryPaymaster.t.sol     |16.7%     12|20.0%     5|    -      0