feat: add contract_summary view — single call returning all key contract state

[BigBen-7]

Description

Dashboards and monitoring tools need a comprehensive snapshot of contract state without making 10+ separate calls. A summary view reduces latency and simplifies client code.

What to do

Create ContractSummary { name: String, symbol: String, decimal: u32, total_supply: i128, max_supply: i128, total_holders: u32, escrow_count: u32, split_count: u32, recurring_count: u32, dispute_count: u32, is_paused: bool, admin: Address, version: String } struct

• Add fn contract_summary(e: Env) -> ContractSummary to contract.rs
• Add test asserting all fields are correct after various operations

Files touched

• src/contract.rs
• src/test.rs

PR requirement

• Closes #[issue_id] — Timeframe: 48 hours