feat: configurable minimum deposit amount

[Jopsan-gm]

Description

Closes #43

Adds tests to enforce the configurable minimum deposit amount in the vault contract.

Changes

• contracts/vault/src/test.rs
  • Added deposit_below_minimum_panics: verifies that a deposit below min_deposit panics with "deposit below minimum"
  • Added deposit_equal_to_minimum_succeeds: verifies that a deposit exactly at the minimum is accepted
  • Added deposit_with_zero_minimum_always_succeeds: verifies that min_deposit = 0 disables the restriction (any amount accepted)
  • Fixed init_none_balance: corrected the init() call signature to include usdc_token and min_deposit parameters

Test Evidence

All deposit-related tests pass:
running 5 tests test test::deposit_below_minimum_panics - should panic ... ok test
test::deposit_equal_to_minimum_succeeds ... ok test 
test::deposit_with_zero_minimum_always_succeeds ... ok test 
test::test_deposit_and_balance ... ok test
test::deposit_and_deduct ... ok

test result: ok. 5 passed; 0 failed; 0 ignored

[greatest0fallt1me]

@Jopsan-gm resolve the conflicts

[Jopsan-gm]

@greatest0fallt1me conflicts resolved!

[greatest0fallt1me]

@Jopsan-gm please resolve the conflicts

[greatest0fallt1me]

@Jopsan-gm

[Jopsan-gm]

Hey @greatest0fallt1me sorry for the delay, the conflicts have been resolved.