test(energy_token): add access control tests for unauthorized mint (#278)

[devSoniia]

Summary

Closes AnnabelJoe#278

The energy_token contract already enforces minter access control via minter.require_auth() in mint() and admin.require_auth() in set_minter(). This PR adds unit tests that verify unauthorized callers are rejected.

Changes

• test_mint_unauthorized_caller_panics — calls mint() without mocking minter auth; expects host auth failure panic
• test_mint_succeeds_with_minter_auth — calls mint() with explicit minter mock_auths; verifies balance updated
• test_set_minter_unauthorized_caller_panics — calls set_minter() without admin auth; expects panic

Testing

cd apps/contracts && cargo test --package energy-token

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✅ cargo audit

�[1m�[32m    Updating�[0m crates.io index
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�[0m�[0m�[1m�[32m    Updating�[0m crates.io index
�[0m�[0m�[1m�[32m    Scanning�[0m Cargo.lock for vulnerabilities (192 crate dependencies)
�[0m�[0m�[1m�[33mCrate:    �[0m derivative
�[0m�[0m�[1m�[33mVersion:  �[0m 2.2.0
�[0m�[0m�[1m�[33mWarning:  �[0m unmaintained
�[0m�[0m�[1m�[33mTitle:    �[0m `derivative` is unmaintained; consider using an alternative
�[0m�[0m�[1m�[33mDate:     �[0m 2024-06-26
�[0m�[0m�[1m�[33mID:       �[0m RUSTSEC-2024-0388
�[0m�[0m�[1m�[33mURL:      �[0m https://rustsec.org/advisories/RUSTSEC-2024-0388
�[0m�[0m�[1m�[33mDependency tree:
�[0mderivative 2.2.0
├── ark-poly 0.4.2
│   └── ark-ec 0.4.2
│       ├── soroban-env-host 23.0.1
│       │   ├── soroban-sdk 23.5.3
│       │   │   ├── multisig-admin 1.0.0
│       │   │   ├── energy-token 1.0.0
│       │   │   ├── community-governance 1.0.0
│       │   │   └── audit-registry 1.0.0
│       │   └── soroban-ledger-snapshot 23.5.3
│       │       └── soroban-sdk 23.5.3
│       └── ark-bls12-381 0.4.0
│           └── soroban-env-host 23.0.1
├── ark-ff 0.4.2
│   ├── soroban-env-host 23.0.1
│   ├── ark-poly 0.4.2
│   ├── ark-ec 0.4.2
│   └── ark-bls12-381 0.4.0
└── ark-ec 0.4.2

�[0m�[0m�[1m�[33mCrate:    �[0m paste
�[0m�[0m�[1m�[33mVersion:  �[0m 1.0.15
�[0m�[0m�[1m�[33mWarning:  �[0m unmaintained
�[0m�[0m�[1m�[33mTitle:    �[0m paste - no longer maintained
�[0m�[0m�[1m�[33mDate:     �[0m 2024-10-07
�[0m�[0m�[1m�[33mID:       �[0m RUSTSEC-2024-0436
�[0m�[0m�[1m�[33mURL:      �[0m https://rustsec.org/advisories/RUSTSEC-2024-0436
�[0m�[0m�[1m�[33mDependency tree:
�[0mpaste 1.0.15
├── wasmi_core 0.13.0
│   └── soroban-wasmi 0.31.1-soroban.20.0.1
│       ├── soroban-env-host 23.0.1
│       │   ├── soroban-sdk 23.5.3
│       │   │   ├── multisig-admin 1.0.0
│       │   │   ├── energy-token 1.0.0
│       │   │   ├── community-governance 1.0.0
│       │   │   └── audit-registry 1.0.0
│       │   └── soroban-ledger-snapshot 23.5.3
│       │       └── soroban-sdk 23.5.3
│       └── soroban-env-common 23.0.1
│           ├── soroban-sdk-macros 23.5.3
│           │   └── soroban-sdk 23.5.3
│           ├── soroban-ledger-snapshot 23.5.3
│           ├── soroban-env-host 23.0.1
│           └── soroban-env-guest 23.0.1
│               └── soroban-sdk 23.5.3
└── ark-ff 0.4.2
    ├── soroban-env-host 23.0.1
    ├── ark-poly 0.4.2
    │   └── ark-ec 0.4.2
    │       ├── soroban-env-host 23.0.1
    │       └── ark-bls12-381 0.4.0
    │           └── soroban-env-host 23.0.1
    ├── ark-ec 0.4.2
    └── ark-bls12-381 0.4.0

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