Issue 369

[sochima2]

close #369

Description
Added funded_ledger_seq: u32 to EscrowJob to record the ledger sequence at deposit time and persisted it in contracts/escrow/src/lib.rs during deposit by setting job.funded_ledger_seq = env.ledger().sequence();.
Implemented fn assert_not_same_ledger_as_funding(env: &Env, job: &EscrowJob) -> Result<(), EscrowError> and integrated this guard into funding-followup flows by calling it from release_milestone, release_funds, open_dispute, raise_dispute, and refund to block same-ledger state changes.
Require admin authentication during initialize via admin.require_auth() to ensure initialization is a strictly authenticated state-modifying action.
Replace naive timestamp arithmetic in create_job with checked operations (checked_mul / checked_add) to prevent overflow when computing expires_at and return an appropriate EscrowError::ArithmeticOverflow on failure.
Added public getters: get_funding_settlement_ledgers, get_remaining_balance, and get_active_escrow_params to expose live escrow parameters and remaining balances for off-chain consumers and indexers.
Kept existing checked arithmetic in milestone summation and release flows (checked_add) and retained reentrancy guards; adjusted small logging call formatting for consistency.

Testing
Ran formatting with cargo fmt --all which completed successfully.
Ran unit tests with cargo test -p escrow and all tests passed: 46 passed; 0 failed (test suite completed successfully).
The modified contract builds and the escrow test binary executed successfully in the test profile during CI-local validation.

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[soomtochukwu]

• Fix merge conflict