Generate Soroban contract TypeScript bindings

[TUPM96]

Closes #443

Summary

• Add stellar-swipe/scripts/generate_abi.sh to generate TypeScript bindings from compiled Soroban WASM artifacts.
• Export abi.json beside each generated binding package using stellar contract info interface.
• Skip helper WASM artifacts that do not expose a Soroban contract interface, so shared/helper crates do not break generation.
• Wire CI to generate and upload stellar-swipe/bindings/** after the optimized WASM build.
• Document the local generation workflow and wrapper script.

Validation

• bash -n stellar-swipe/scripts/generate_abi.sh; bash -n scripts/generate_abi.sh
• Smoke-tested generate_abi.sh with a fake stellar executable to verify TypeScript binding generation, abi.json output, and non-contract WASM skipping.
• git diff --cached --check

Note

• cargo fmt --all -- --check is currently blocked on the repository baseline by existing formatting drift plus parse errors in contracts/auto_trade/src/test.rs and contracts/trade_executor/src/lib.rs; this PR only changes shell/docs/workflow files.

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