added Soroban contract interface inspection, client generator, compatibility checker, and authorization preparation examples

[DokaIzk]

• Add 193-soroban-contract-interface.ts to inspect deployed Soroban contract interfaces, exported functions, argument/return types, and custom types
• Add 194-soroban-contract-client-generator.ts to generate strongly typed TypeScript contract client wrappers, type definitions, and ScVal conversion helpers
• Add 195-soroban-interface-compatibility.ts to compare contract specifications, detect additions/removals/type changes, and classify breaking vs compatible modifications
• Add 196-soroban-authorization-preparation.ts to prepare, inspect, decode, and round-trip verify Soroban authorization entries and invocation trees without signing
• Register examples in central catalog and update test suites and documentation

Closes #255
Closes #256
Closes #257
Closes #258

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